decimal numbers part 3

136
____________ 1. The number we if multiply. ____________ 2. The numbers multiplied together. ____________ 3. The number that multiplies. ____________ 4. It is a short way of adding the same number of number times. ____________ 5. Multiplication is the inverse of _____________

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Decimal Numbers-Part 3

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Page 1: Decimal Numbers Part 3

____________ 1. The number we if multiply.

____________ 2. The numbers multiplied together.

____________ 3. The number that multiplies.

____________ 4. It is a short way of adding the same number of number times.

____________ 5. Multiplication is the inverse of _____________

Page 2: Decimal Numbers Part 3

III. Complete the following that corresponds to themissing answer.

1. 0.42 - ______ 6. 0.183 - ______ x 0.34 - ______ x 0.141 - ______ _____ - product _____ - product

2. 0.12 - ______ 7. 12.55 - ______ x ____ - multiplier x 21.45 - ______0.0132 - ______ _____ - product

3. ____ - multiplicand 8. ____ - multiplicand x 4.62 - _______ x 0.96 - _______ 0.1848 - _______ 0.1848 - _______

Page 3: Decimal Numbers Part 3

4. 56.08 - ______ 9. 1.45 - ______ x 31.901 - ______ x 6.56 - _____________ - product ______ - product

5. 8.08 - multiplicand 10. 8.145 - multiplicandx 8.14 - multiplier x 6.001 - multiplier _____ -________ _____ -________

Page 4: Decimal Numbers Part 3

Lesson 22MULTIPLYING DECIMALS

Lesson Objectives: After finishing the lesson, the students are expected to:1. Learn how to multiply decimal numbers.2. Follow the steps in multiplying decimal numbers.3. Know how to place the decimal point in the product.

Page 5: Decimal Numbers Part 3

Study these examples. Where do you place the decimal point in the product?

0.432 0.614 × 0.15 × 0.37

2160 4298 + 432 + 1842_ 0.06480 0.22718

Page 6: Decimal Numbers Part 3

Remember:In multiplying decimals, the

placement of the decimal point in the product is determined by the total number of decimal places in the factors. Count the number of decimal places from the right. To check, divide the product by either factors.

Page 7: Decimal Numbers Part 3

6480 four digits 22718 five digitsAdd a zero to make Additional zeros isfive decimal places in theproduct. not needed.0.06480 0.2271

AdditionalZero

Add the decimal places in the factors. Then see how many decimal places the product has.

0.432 × 0.15

Five decimal places

0.614 × 0.37

Five decimal places

Page 8: Decimal Numbers Part 3

PRACTICE:

Find the product by fill in the boxes for the correct answer.

0.3 0.2 0.4

0.1 0.5 0.6

0.4 0.7 0.3

0.5 0.4 0.3

0.7 0.6 0.8

0.4 0.2 0.10.5 0.4 0.3

0.7 0.6 0.8

0.4 0.2 0.1

Page 9: Decimal Numbers Part 3

1.9 1.5 1.8

2.5 3.5 2.0

3.5 3.8 3.1

0.1 0.44 0.87

0.54 0.53 0.09

0.9 0.76 0.36

1.90 1.2 2.9

1.8 2.2 2.99

1.66 0.8 1.52.2 1.4 1.9

1.4 1.7 1.9

1.7 2.0 2.7 1.6 1.8 1.7

1.89 1.89 1.7

2.7 2.6 2.9

Page 10: Decimal Numbers Part 3

I. Put the decimal point on the product for the correct places.

1. 0.192 x 0.428 1536

384 + 768__

82176

2. 0.342 x 0.153

1026 1710 + 342

52326

3. 0.208 x 0.274

832 1456 + 416 56992

Page 11: Decimal Numbers Part 3

4. 0.263 x 0.29

2367 + 526 7627

5. 0.1594 x 0.37

11158 + 47852 58978

III. Multiply the following decimal numbers and putthe decimal point.

1. 0.987 x 0. 270

2. 0.158x 0.258

3. 0.4789 x 0.1247

Page 12: Decimal Numbers Part 3

4. 0.2547 x 0.2479

5. 0.3647 x 0.1248

Page 13: Decimal Numbers Part 3

What did the big flower say about the little flower?

To find the answer, write each of the following productsin multiplying decimals.

Page 14: Decimal Numbers Part 3

__________ ___________ ___________ __________

0. 7537344 0.0132 0.0003 0.08537832

___________ ___________

0.001445 0.290523

_________ __________ _________ ________ ________

0.0000195 0.0044902 0.000492 0.05626725 0.0006

Page 15: Decimal Numbers Part 3

Lesson 23MULTIPLYING MIXED DECIMALS BY

WHOLE NUMBERS

Lesson Objectives: After finishing the lesson, the students are expected to:1. Multiply mixed decimals by whole numbers.

2. Find the partial products. 3.Understand the rules in multiplying mixed decimals by whole numbers.

Page 16: Decimal Numbers Part 3

Christopher can save Php. 18.65 in one month. How much money can he save in four months?

18.6 → two decimal placesx 474.60

Decimals are multiplied the same way as whole number.

Page 17: Decimal Numbers Part 3

Remember:In multiplying mixed decimals by

whole numbers, count the decimal places in the mixed decimal to determine the placement of the decimal point in the product. Start counting the number of decimal places from the right.

Page 18: Decimal Numbers Part 3

Study other examples.

23.729 → three decimal placesx 47

166103 + 94916 1115.263

Partialproduct

Page 19: Decimal Numbers Part 3

6.3572 → four decimal placesx 158

508576 317860 + 63572 1004.4376

Partialproduct

Page 20: Decimal Numbers Part 3

I. In the following problems, the final product is given. Find the partial products. Place the decimal points in the correct position.

1. 81.83 2. 62.872 3. 7.0194 × 57 × 34 × 271

+ + 466431 2137648 +

19022574

Page 21: Decimal Numbers Part 3

4. 17.59 5. 48.723 6. 8.0035 × 83 × 52 × 179

+ + 145997 2533596 +

14326265

Page 22: Decimal Numbers Part 3

II. Find the product.

7. 934.04 8. 282.5601 9. 37.5852 × 251 x 49 × 784

10. 51.207 11. 4672.397 12. 693.3521 × 490 × 268 × 922

Page 23: Decimal Numbers Part 3

13. 75.373 14. 149.1811 15. 10.1496 x 44 x 1012 x 189

Page 24: Decimal Numbers Part 3

Lesson 24MULTIPLICATION OF MIXED DECIMALS BY

MIXED DECIMALS

Lesson Objectives: After accomplishing this lesson, you are expected to:1. Multiplying mixed decimals by mixed decimals.

2. Perform the operation correctly. 3. Understand the rules in multiplying mixed

decimals by mixed decimals.

Page 25: Decimal Numbers Part 3

What is the area of Ariel’s backyard if it is 12.932 m long and 8.45 m wide? NOTE:

Area = length x width = 12.93m x 8.45m = 109.27540 sq.m² = m x m = m²

12.932 → three decimal places × 8.45 → two decimal places

64660 51728+ 103456 109.27540 → five decimal places

The backyard is 109.27540 square meters.

Page 26: Decimal Numbers Part 3

NOTE:Area = length x width = 12.93m x 8.45m = 109.27540 sq.m² = m x m = m²

When multiplying mixed decimals

by mixed decimals, the

decimal point of the product is determined in this manner.

Page 27: Decimal Numbers Part 3

Decimal Decimal DecimalPlaces of first Places of second Places of Factor Factor the product

Page 28: Decimal Numbers Part 3

I. Rewrite and arrange the partial products properly. Find the product and place the decimal points in the correct position.

1. 4.9526 2. 9.18234 × 3.215 × 75.68 247630 7345872

49526 5509404 99052 451170

+ 148578 + 6427638

Page 29: Decimal Numbers Part 3

3. 57.6012 4. 2.01938 × 4.765 × 36.24

2880060 8077523456072 4038764032084 1211628

+ 2304048 + 605814

Page 30: Decimal Numbers Part 3

Find the product.

5. 15.6027 6. 92.46355 7. 8.932682 × 8.306 × 1.728 × 9.1865

8. 743.9516 9. 268.924 10. 5.1367× 4.321 × 4.321 × 9.824

Page 31: Decimal Numbers Part 3

Lesson 25MULTIPLYING DECIMALS BY 10, 100 and 1000

Lesson Objectives: At the end of the lesson, you are expected to:1. Multiply decimals by 10, 100 and 1000.

2. Write the product correctly. 3. Observe the rules in multiplying decimals

by 10, 100 and 1000.

Page 32: Decimal Numbers Part 3

Take a decimal, 0.7568. Multiply it by 10, by 100 and by 1,000. What are the products?

Look at the following:

0.7568 0.7568 0.7568 × 10 × 100 × 1000

7.5680 75.6800 756.8000

Page 33: Decimal Numbers Part 3

You see that the number of zeros contained in the factors 10, 100 and 1,000 tells how many places the decimal point in the other factor must be moved to the right to get the product.

Examples:

10 × 0.75 = _______100 × 0.75 = _______1,000 × 0.75 = _______

Page 34: Decimal Numbers Part 3

Observe:

750.75.7.5

0. 7500. 750.75

0.7500.750.750.75

× 1,000× 100× 10Decimal

Move 1 place to the right.

Move 2 place to

the right.

Move 3 place to the

right.

Page 35: Decimal Numbers Part 3

Complete the following equations.

1.3.67 × 10 = ______2.100 × _____ = 45213.1000 × _____ = 0.00494._____ × 100 = 854.85.2.918 × _____ = 29186.35.66 × _____ = 356607.0.0074 × _____ = 7.48._____ × 10 = 0.1639.0.089 × 10 = _____10. _____ × 100 = 100.78

Page 36: Decimal Numbers Part 3

II. Complete the table by multiplying each factor by 10, 100 and 1,000.

Page 37: Decimal Numbers Part 3

III. Multiply the following. Write your answers in the blanks provided:

1. 0.386 × 10 = ________2. 0.86 × 100 = ________3. 0.36 × 1000 = ________4. 0.473 × 1000 = ________5. 0.496 × 10 = ________6. 0.85 × 1000 = ________7. 0.7 × 1000 = ________8. 0.512 × 100 = ________9. 0.93 × 100 = ________10. 0.603 × 10 = ________

Page 38: Decimal Numbers Part 3

Lesson 26ESTIMATING PRODUCTS OF DECIMAL

NUMBERS

Lesson Objectives: After understanding the lesson, you must able to:1. Learn how to estimate the products correctly.

2. Learn how to make an estimates product infastest way.

3. Follow the steps in estimating products.

Page 39: Decimal Numbers Part 3

The fastest way of solving problem is to estimate. In estimating the products:

Round the given decimal numbers to the highest place value.

Estimate and multiply. Compute the exact answer.

Products can be estimated in the same way as sum and difference.

Page 40: Decimal Numbers Part 3

1. Rounding Method

4.52 × 6 27.12

Actual Value Rounded Value

5.00× 6 30.00

2. Front End Method

4.56 4.00 4.52 .50 450 × 6 × 6 × 6 × 6 × 6 24.00 + 3.00 = 27.00

Page 41: Decimal Numbers Part 3

The front – end method with adjustment is usually closer to the actual value.

Page 42: Decimal Numbers Part 3

I.Estimate the product using rounding and front-end with adjustment.

1. 3.754 2. 48.263 3. 28.169 × 8 × 5 × 7

Page 43: Decimal Numbers Part 3

4. 38.721 5. 28.765 6. 75.814 × 3 × 9 × 13

7. 96.250 8. 18.263 9. 927.231 × 42 × 41 × 507

Page 44: Decimal Numbers Part 3

10. 36.287 11. 76.298 12. 28.183 × 206 × 304 × 543

Page 45: Decimal Numbers Part 3

Lesson 27PROBLEM SOLVING INVOLVING

MULTIPLICATION OF DECIMAL NUMBERS

Lesson Objectives: After understanding the lesson, you must

able to:1.Solve word problem involving multiplication of

decimals.2.Write the numbers sentence.3.Solve word problems correctly and accurately.

Page 46: Decimal Numbers Part 3

Example 1:

A cone of ice cream costs Php. 16.25, how much in all did the 6 children spend for ice cream?

Page 47: Decimal Numbers Part 3

Example 2:

What is the area of a rectangle with a length of 9.72 cm and width of 6.34 cm?

Page 48: Decimal Numbers Part 3

Read, analyze and translate these problems to number sentence then solve.

1. Mrs. Hernandez baked 1,000 pineapple pies for a party of her daughter Kiana. If each pie costs Php. 17.85, how much did the 1,000 pies cost?

Page 49: Decimal Numbers Part 3

2. If a car travels 55.6 km an hour, how far will it travel in 8 hours?

Page 50: Decimal Numbers Part 3

3. Mang Freddie sold 46 cotton candies at Php. 2.15 each. How much altogether is the cost of the cotton candies?

Page 51: Decimal Numbers Part 3

4. A rope measures 4.63 m. How long is it in centimeters?

Page 52: Decimal Numbers Part 3

5. If 1 meter of cloth costs Php. 72.95, how would 6.5 meters cost?

Page 53: Decimal Numbers Part 3

6. Mang John, a balot vendor bought 120 new duck eggs at Php. 3.85 each. How much did he pay all the eggs?

Page 54: Decimal Numbers Part 3

7. A can of powdered milk has a mass of 0.345 kilogram. What is the mass of 12 cans of milk?

Page 55: Decimal Numbers Part 3

8. Mr. Gelo Drona bought a residential lot with an area of 180.75 m at Php. 650.00 per square meter. How much did he pay for the lot?

Page 56: Decimal Numbers Part 3

9. Niña works 40 hours a week. If his hourly rate is Php. 640.25, how much is she paid a week?

Page 57: Decimal Numbers Part 3

10. The rental for a Tamaraw FX is Php. 3,500 a day. What will it cost you to rent it in 3.5 days?

Page 58: Decimal Numbers Part 3
Page 59: Decimal Numbers Part 3

OVERVIEW OF THE MODULAR WORKBOOK

This modular workbook provides you’re the language of division of decimal numbers and how to divide decimals in different ways.

OBJECTIVES OF THE MODULAR WORKBOOKAfter finishing this unit, you are expected to:

1. Understand the language of division of decimals.

2. Know how to divide decimal numbers.3. Follow the steps in division of decimal numbers.4. Participate actively in division of decimal numbers.5. Learn the different form of dividing decimal numbers.

Page 60: Decimal Numbers Part 3

Lesson 28MEANING OF DIVISION OF DECIMAL

NUMBERS

Lesson Objectives:After accomplishing this lesson, you are

expected to:1. Define division.2. Understand the language in division of decimals.3. Know the parts in dividing decimal numbers.

Page 61: Decimal Numbers Part 3

Division is the process of finding out how many times one number is contained in another number.

Division is the process of finding out how many times one number is contained in another number.

0.09 → quotient9 0.81 → dividend - 0 81 - 81 0

Divisor

Page 62: Decimal Numbers Part 3

The number that contains another number a number of times is called the dividend. The number that is contained in another number a number of times is called the divisor. The number that indicated how many times a number contained in another number is called the quotient.

Division may also be defined as the process of separating a number into as many equal parts as indicated by another number. The symbol for division ( ÷ ), which is read as “divided by”. Thus, 0.81 ÷ 9 = 0.09 is read as “eight-one hundredths divided by nine equals nine thousandths.”

Page 63: Decimal Numbers Part 3

Another symbol is a line written over and above the dividend and a slanting line connecting it at the left of the dividend and at the right of the divisor.

Another symbol is a line over which the dividend is written and the divisor below.

0.81 9

Page 64: Decimal Numbers Part 3

I. Give the meaning and explain the use of the following: 5points each.

What is division?What is

division?What is divisor?What is divisor?

What is dividend?What is

dividend? What is quotient

?

What is quotient

?

Page 65: Decimal Numbers Part 3

1. Division ____________________________________________________________________________________

2. Divisor____________________________________________________________________________________

3. Dividend ____________________________________________________________________________________

4. Quotient ____________________________________________________________________________________

Page 66: Decimal Numbers Part 3

II. Enumeration…

A. What are the parts of division?B. What symbols that can be used in dividing numbers?

A._____________________________________________________________________________________________________________________________

B._____________________________________________________________________________________________________________________________

Page 67: Decimal Numbers Part 3

Lesson 29DIVIDING DECIMAL BY WHOLE NUMBERS

Lesson Objectives:After accomplishing this lesson, you are

expected to:1. Divide decimals by whole numbers.2. Follow the rules in dividing decimals by whole numbers.3. Find the quotient correctly.4. Using two methods in dividing decimals.

Page 68: Decimal Numbers Part 3

Dividing decimals by a whole number is the same as dividing a whole number by another whole number.

Observe the following examples.

0.15 0.054 0.60 9 0.45 - 4 - 0 20 45 - 20 - 45 0 0

Page 69: Decimal Numbers Part 3

To check the answer, multiply the quotient by the divisor:

0.15 x 4

0.60

0.05 x 9

0.45

In dividing decimals by whole numbers, the number of decimal places in the quotient equals the number of decimal in the dividend.

Page 70: Decimal Numbers Part 3

Look at the other examples: Example 1: 0.6 ÷ 3 = _____

We used 2 methods in dividing decimals by whole numbers.

Page 71: Decimal Numbers Part 3

1. Using a region

0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1

0.2 0.2 0.2 0.2 0.2

0.6

A whole is divided into 10 equal parts. Each part is called 1/10 or 0.1. 6/10 or 0.6 are shaded.0.6 is divided into 3 groups.

How many tenths are in each group?

Page 72: Decimal Numbers Part 3

2. Using computations

6 ÷ 3 = 6 ÷ 3 = 210 1 10 ÷ 1 = 10

0.2 3 0.6 6 0

Let us check by using reciprocals.

Fractional Division:

6 ÷ 2 = 6 x 3 = 6 x 3 = 18 10 3 10 2 10 x 2 20

Page 73: Decimal Numbers Part 3

6 ÷ 3 = 6 × 1 = 6 = 1 = 0.2 and 110 10 3 30 5 5

is equivalent

to 0.2

Why? Explain. 6 ÷ 6 = 1 30 6 5

0.2 5 1.0 1.0 0

Page 74: Decimal Numbers Part 3

Let us divide hundredths by a whole number.

Example 2: 6 0.18

1 2 3 4 5 6 7 8 9 10

1 2 3 4 5 6 7 8 910

1. Using a region A whole is divided into 100 equal pairs. Each part is called 1/100. Eighteen parts are called 18/100 or 0.18. We divide 0.18 in 6 groups.

Page 75: Decimal Numbers Part 3

How many hundredths are in each group?

Using computation 18 ÷ 6 = 18 ÷ 6 = 3100 1 100 ÷ 1 100

to get the tenths place. 0.03 → Quotient

6 0.18 - 18

0

Check: 6× 0.03 0.18

Page 76: Decimal Numbers Part 3

I. Find the quotient by using region and computations.

1.3 0.12 2. 5 0.35 3. 7 0.14

4. 3 0.42 5. 8 0.64 6. 4 0.56

Page 77: Decimal Numbers Part 3

7. 2 0.6 8. 9 0.81 9. 4 0.424

I.Find the quotients. Answer the question that follows.

1. 6 0.732 2. 4 0.524 3. 2 0.236

4. 5 0.655 5. 4 0.435 6. 7 0.851

Page 78: Decimal Numbers Part 3

How many decimal places are in the dividends of 1 to 6?________________________________________________________________________________How many decimal places should there be in the quotient?________________________________________________________________________________How many we use zero in the quotient?________________________________________________________________________________

Page 79: Decimal Numbers Part 3

Lesson 30DIVIDING MIXED DECIMAL BY WHOLE

NUMBERS

Lesson Objectives:After accomplishing this lesson, you are expected to:1.Divide mixed decimals by whole numbers.2.Understand the rule in dividing mixed

decimals by whole numbers.3.Answer the operation correctly.

Page 80: Decimal Numbers Part 3

Divide mixed decimals in the same way as in dividing whole numbers. To check, multiply the quotient by the divisor.Long method of division:

1.5734 5 7.8670 - 5

28 - 25 36 - 35

17 - 15 20 - 20 0

To check, multiply the quotient by the divisor.

1.5734x 57.8670

Page 81: Decimal Numbers Part 3

Remember that zeros added to a number to the right of the decimal point does not affect the value of the number.

7.8670 = 7.867

When dividing mixed decimals by whole numbers. The number of decimal places in the quotient is equal to the number of decimal places in the dividend. Align the decimal points of the quotient with that of the dividend.

Page 82: Decimal Numbers Part 3

Do another division.

To check, multiply…

Answer (quotient by

division)

Answer (quotient by

division)

5.1268x 14 205072 51268 71.7752

5.1268 14 71.1152

- 70 17 - 14

37 - 28

95 - 85

112 - 112 0

Page 83: Decimal Numbers Part 3

I. Find the quotient. Check bymultiplication.

CHECKING:

1.48.102 ÷ 21 =

2.56.381 ÷ 87 =

Page 84: Decimal Numbers Part 3

3. 140.722 ÷ 9 =

4. 28.6134 ÷ 5 =

5. 189.526 ÷ 32=

Page 85: Decimal Numbers Part 3

II. Solve for the quotient and check by longmultiplication method.

CHECKING:

1. 83.7169 ÷ 21 =

2. 92.0314 ÷ 37 =

Page 86: Decimal Numbers Part 3

3. 152.51 ÷ 28 =

4. 293.763 ÷ 48 =

5. 451.306 ÷ 89 =

Page 87: Decimal Numbers Part 3

Lesson 31DIVIDING WHOLE NUMBERS BY DECIMALS

Lesson Objectives:After accomplishing the lesson, the students are expected to:1. Divide whole numbers by decimals.2. State the rule for dividing a whole number by a decimal.3. Find the quotient correctly.

Page 88: Decimal Numbers Part 3

Let us divide whole numbers by decimals in

tenths.

Example 1: 0.8 72

Here are the steps in dividing whole numbers by

decimals...

STEP 1 Before we divide, we must change the divisor to a whole number. We multiply 0.8 by 10. We have 8.

Page 89: Decimal Numbers Part 3

STEP 2 We multiply the dividends by 10 also. 10 x 72 = 720, we

have 720 as dividend.

STEP 3 Then we begin to divide.

90 → quotient8 720 - 72 0

We check: 90 × 0.8

72.0

STEP 4

Page 90: Decimal Numbers Part 3

How we divide a whole number by a decimal in the

hundredths?

Follow this step to find the quotient.

Page 91: Decimal Numbers Part 3

Example 2: 0.14 588

STEP 1 Make the divisor a whole number.Multiply it by 100.

0.14 x 100 = 14 0.14 588

STEP 2 Multiply the dividend by 100.

14 588.00

Page 92: Decimal Numbers Part 3

STEP 3 Then divide as if dividing whole numbers. 4200

14 58800 -56 28 - 28 0

STEP 4 We check: 4200x 0.14 16800 4200 58000

Page 93: Decimal Numbers Part 3

I. Find the quotient and check.

1. 0.3 ÷ 936 =

2. 0.8 ÷ 856 =

CHECKING:

Page 94: Decimal Numbers Part 3

3. 0.9 ÷ 756 =

4. 0.5 ÷ 485 =

5. 0.4 ÷ 348 =

Page 95: Decimal Numbers Part 3

6. 0.6 ÷ 911 =

7. 0.2 ÷ 613 =

8. 0.7 ÷ 518 =

Page 96: Decimal Numbers Part 3

9. 0.2 ÷ 434 =

10. 0.5 ÷ 775 =

11. 0.7 ÷ 434 =

Page 97: Decimal Numbers Part 3

12. 0.7 ÷ 714 =

13. 0.8 ÷ 872 =

14. 0.6 ÷ 846 =

15. 0.5 ÷ 305 =

Page 98: Decimal Numbers Part 3

Lesson 32DIVIDING WHOLE NUMBERS BY MIXED

DECIMALS

Lesson Objectives:At the end of the lesson, the students are expected to: 1. Divide whole numbers by mixed decimals 2. Follow the rule in dividing whole numbers by mixed decimals. 3. Study division where the quotient is found to the ten thousandths place.

Page 99: Decimal Numbers Part 3

Let us observe the rule in dividing whole numbers by mixed decimals.

Example 1:Move the decimal point in the divisor to make it a whole number. The number of places the decimal has been moved to the right in the divisor is the same as the number of places the decimal point is to be moved in the dividend. Add the appropriate zeros to the dividend. Align the decimal point of the dividend.

Page 100: Decimal Numbers Part 3

In dividing decimals always try to divide to the last digit. When there are too many digits to divide, you can stop at the division by multiplying the quotient by the divisor. Divide 84 by 1.25.

67.21.25 84.00.0 - 750 900 - 875 250 - 250 0

67.2 x 1.25 33.60 13.44+ 67.2 84.000

Page 101: Decimal Numbers Part 3

Check the divisor by multiplying the quotient by the divisor.

Study another division where the quotient is found to the ten thousandths place.

Page 102: Decimal Numbers Part 3

Example 2: 16.0516

5.42 87.00.0000

- 542 3280 - 3252 280 - 000 2800 - 2710 900 - 542 3580 - 3252 328

To check:

16.0516 × 5.42 0.321032 6.42064 80.2580 86.999672 + 0.000328 87.000000

Page 103: Decimal Numbers Part 3

I. Find the quotient to the ten thousandths place then check.

CHECKING:

1.15 ÷ 4.7 =

2. 9 ÷ 5.28 =

3. 86 ÷ 7.245 =

Page 104: Decimal Numbers Part 3

4. 16. ÷ 7.32 =

5. 23 ÷ 8.16 =

6. 43 ÷ 15.8 =

Page 105: Decimal Numbers Part 3

7. 8 ÷ 1.43 =

8. 15 ÷ 3.786 =

9. 74 ÷ 16.37 =

10. 22 ÷ 5.61 =

Page 106: Decimal Numbers Part 3

Lesson 33DIVIDING DECIMAL BY DECIMALS

Lesson Objectives:At the end of the lesson, the students are expected to:1. Divide decimals by decimals.2. Follow the step in dividing decimals by decimals3. Use fraction in checking the division of decimals.

Page 107: Decimal Numbers Part 3

How is division done with decimals? What do we do with the decimal points? Let’s observe the following example.

STEP 1 STEP 2 STEP 30.5 0.75 5 0.7.5 1.5

5 7.5 - 5 25 - 25 0

Multiply 0.5 by 10 to make it a whole number.

Multiply 0.75 by 10 also. What we do with the divisor, we do to the dividend.

Divide just like whole numbers. The quotient has the same number of decimal places as the dividend.

Example: 0.5 0.75

Page 108: Decimal Numbers Part 3

Let us check by using fractions.

75 ÷ 5 = 75 ÷ 5 = 15 or 1 5 or 1.5100 10 100 ÷ 10 10 10

Page 109: Decimal Numbers Part 3

I. Divide the following and check it by using fractions.

1.0.72 ÷ 0.3 =

2. 0.96 ÷ 0.4 =

3. 0.387 ÷ 0.09 =

CHECKING:

Page 110: Decimal Numbers Part 3

4. 0.516 ÷ 0.6 =

5. 0.81 ÷ 0.9 =

6. 0.96 ÷ 0.8 =

Page 111: Decimal Numbers Part 3

7. 0.441 ÷ 0.7 =

8. 0.558 ÷ 0.06 =

9. 0.36 ÷ 0.3 =

10. 0.72 ÷ 0.8 =

Page 112: Decimal Numbers Part 3

II. Try to analyze. Check your answer.

1. 0.56 ÷ 0.008 =

2. 0.90 ÷ 0.090 =

CHECKING:

Page 113: Decimal Numbers Part 3

3. 0.72 ÷ 0.4 =

4. 0.26 ÷ 0.2 =

5. 0.9015 ÷ 0.5 =

Page 114: Decimal Numbers Part 3

Lesson 34Dividing Mixed Decimals by Mixed Decimals

Lesson Objectives:At the end of the lesson, the students are

expected to:1.Divide mixed decimals by mixed decimals.

2. Observe the rule in dividing mixed decimals by mixed decimals.3. Perform the operation correctly.

Page 115: Decimal Numbers Part 3

A full-grown Philippine eagle can grow to length of 102.6 cm including its tail. The tail can reach 49. 8 cm. When one of its wings is spread out, it can reach 63.2 cm. The length of its tail is what part of its whole length?Divide 102.6 cm (total length) by 49.8 cm (tail) to the hundredthsplace.

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Move the decimal point one place to the right. The number of decimal places point has been moved in the divisor determines the number of decimal places it is moved in the dividend.

2. 0649.8. 102. 6. 00

- 996 300 - 000 3000 - 2988 12

To check, multiply it.

49.8 x 2.06 2.9 88 0.00 99.6__102.5 88+ 0.0 12102.6 00

In the case like this, when the remainder is added, the sum is equal to the dividend.

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Mixed Decimals are divided in the same way as whole numbers. In dividing mixed decimals by mixed decimals, remember that the decimal point in the divisor is moved to the right to make it a whole number.

Page 118: Decimal Numbers Part 3

I. Find the quotient to the tenths place. Check it through multiplication.

1.8.376 ÷ 1.942 =

2. 7.801 ÷ 2.334 =

3. 9.482 ÷ 4.7636 =

CHECKING:

Page 119: Decimal Numbers Part 3

4. 10.857 ÷ 6.135 =

5. 23.154 ÷ 5.719 =

6. 41.028 ÷ 12.149 =

Page 120: Decimal Numbers Part 3

7. 183.945 ÷ 20.132 =

8. 151.932 ÷ 46.741 =

9. 273.921 ÷ 87.553 =

10. 491.72 ÷ 78.521 =

Page 121: Decimal Numbers Part 3
Page 122: Decimal Numbers Part 3

PAMN FAYE HAZEL M. VALIN

Brgy Bagong Pook Sta. Maria, LagunaJanuary 8, 1991E-mail Address :

[email protected]

Page 123: Decimal Numbers Part 3

EDUCATIONAL ATTAINMENTElementary

Santa Maria Elementary SchoolSecondary

Santa Maria National High SchoolTertiary

Laguna State Polytechnic University (Formerly LSPC) Siniloan Host Campus

CourseBachelor of Elementary Education

MajorGeneral Education

Page 124: Decimal Numbers Part 3

RON ANGELO A. DRONA

Patricio Street, Brgy. San Jose Pangil, LagunaJune 04, 1991

E-mail Address : [email protected]

Page 125: Decimal Numbers Part 3

EDUCATIONAL ATTAINMENTElementary

Pangil Elementary SchoolSecondary

Laguna State Polytechnic University (Formerly LSPC) Siniloan Host Campus

TertiaryLaguna State Polytechnic University (Formerly LSPC) Siniloan Host Campus

CourseBachelor of Elementary Education

MajorGeneral Education

Page 126: Decimal Numbers Part 3

BEATRIZ P. RAYMUNDO

Brgy Bagong Pook Sta. Maria, LagunaApril 21, 1951

E-mail Address : [email protected]

Page 127: Decimal Numbers Part 3

EDUCATIONAL ATTAINMENT

ElementarySanta Maria Elementary School

SecondarySanta Maria Academy

TertiaryImmaculate Conception College

CourseBachelor of Secondary Education

Page 128: Decimal Numbers Part 3

MajorMathematics

MinorEnglish

Master’s DegreeMA Teaching (National Teacher’s College,

Manila)Teacher in Values Education and Filipino

Page 129: Decimal Numbers Part 3

FOR-IAN V. SANDOVAL

Siniloan, LagunaApril 5, 1979

E-mail Address : [email protected]

Page 130: Decimal Numbers Part 3

EDUCATIONAL ATTAINMENT

ElementaryPalasan Elementary School

SecondaryUnion College of Laguna

TertiaryFar Eastern University

CourseBachelor of Science in MathematicsBachelor of Secondary Education

(Unit Earner)

Page 131: Decimal Numbers Part 3

MajorComputer Science

Master’s DegreeMaster of Arts in Education Major in

Educational Management (with units)

Page 132: Decimal Numbers Part 3
Page 133: Decimal Numbers Part 3

Benigno, Gloria D. Basic Mathematics for College Students. Manila: REX Bookstore. 1993.

Calderon, Jose F. Basic Mathematics I. Quezon City: Great Books Trading. 1994.

Del Fiero, Jong. Power in Numbers 6. Manila: Saint Mary’s Publishing Corporation. 1999.

Department of Education Culture and Sports. Mathematics in Everyday Life (textbook for Grade V) Revised edition. Manila: Cacho Hermanos Inc., 1993.

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Department of Education. Lesson Guides in Elementary (Mathematics for Grade VI). Bureau of Elementary Education in coordination with Ateneo de Manila University., 2003

Ibe, Milagros D. et. al. Highschool Mathematics-Concept and Operation, 3rd edition, First Year. Manila: DIWA Learning Systems Inc., 1999.

Jovero, Natividad V. Power in Numbers IV (Teachers Manual, Mathematics 4). Manila: Saint Mary’s Publishing Corporation. 1999.

Llanes, Estrelita M. and Li, Bernardino Q. Living with Math VI. Revised Edition. Quezon City: FNB Educational Inc. 1988.

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Lopez, Kelli L., The Self-replicating Gene. Tatsulok. Vol. 14 No. 2 1st year. Pp 4-6,15.

Mendoza, Marilyn O. Workbook in Mathematics. Manila: Gintong Aral Publication. 1997.

Roxas, Mia P. and Zara, Evelyn F. Elementary Algebra. High School Mathematics. (Worktext I). EFEREZA Pulbication House. 2003.

http://www.321know.com

http://whyslopes.com

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