5th grade decimal computation
DESCRIPTION
5th Grade Decimal Computation. Mrs. Berish. Click on the topic to go to that section. Decimal Computation Unit Topics. Decimal Addition. Decimal Subtraction. Multiplication of Multi-Digit Numbers. Decimal Multiplication. Mixed Word Problems. Decimal Addition. Click to return to the - PowerPoint PPT PresentationTRANSCRIPT
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Decimal Computation Unit Topics
• Decimal Addition
• Decimal Subtraction
• Multiplication of Multi-Digit Numbers
Click on the topic to go to that section
• Decimal Multiplication
• Mixed Word Problems
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Decimal Addition
Click to return to the table of contents
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When adding or subtracting decimals, always remember to align the decimals vertically...
0.250.250.250.251.00+
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If you know how to add whole numbers then you can add decimals. Just follow these few steps.
Step 1:
Step 2:
Step 3:
Put the numbers in a vertical column, aligning the decimal points.
Add each column of digits, starting on the right and working left.
Place the decimal point in the answer directly below the decimal points that you lined up in Step 1.
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Now, try this - Don't forget - LINE 'EM UP
0.2 + 1.35 + 0.09 + 2.41
0.201.350.092.41+
×
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1 Find the sum:
0.3 + 0.47
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2 Find the sum:
1.5 + 0.3
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3 Find the sum:
0.7 + 0.06 + 1.5
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4 Find the sum:
0.064 + 1.27 + 29.8
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Add decimals
0.25 0.25 0.25 0.25
Four quarters equal one dollar
= $1.00
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5 Find the sum:
10.7 + 107 + 1.07 + 0.107
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Let's go to Cool Math and practice more addition:
Cool Math Linkclick here
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6 Alice went bike riding at a park outside Newark. She biked 4.79 miles in the morning and 5.12 miles after lunch. How many miles did Alice bike in all?
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7 Jeremy bought a jacket for $37.99 and a pair of jeans for $39.50. How much did Jeremy spend in all?
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8 On Friday, it rained 1.19 inches and on Saturday, it rained 1.73 inches. How much did it rain on Friday and Saturday combined?
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9 Steven has $252.35 in his savings account. He makes deposits of $24.65 and $49.50. What is the new balance in his savings account?
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10 Mr. Smith bought 3.5 pounds of ground beef and 2.485 pounds of sliced turkey. How many pounds of meat did he buy in all?
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11 The average temperature in May in Plainsville is 64.9 degrees F. This year the average temperature in May was 7.5 degrees higher than normal. What was the average temperature in Plainsville this May?
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12 Corey bought 86.2 grams of walnuts and 52.89 grams of chopped almonds. How many grams of nuts did he buy all together?
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13 A relay race consists of four sections. Teams A completes the first section in 112.5 seconds, the second section in 124.43 seconds, the third section in 97.82 seconds, and the last section in 103 seconds. How much time did it take Team A to run the entire relay race?
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Decimal Subtraction
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Put the numbers in a vertical column aligning the decimal points.
1.2- 0.8
Subtract the numbers from right to left using the same rules as whole numbers.
1.2- 0.8
0.4
Subtract decimals
10
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What do we do if there aren't enough decimal places when we subtract?
5.2 - 3.08
Don't forget...Line 'em Up!
5.23.08
What goes here?
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14 Find the difference
3.6 - 2.1
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15 Find the difference
8.05 - 6.23
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16 Find the difference
3.84 - 0.29
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17 Find the difference
36.784 - 32
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18 Find the difference
6.8 - 4.23
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19 Find the difference
2 - 0.59
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Cool Math Linkclick here
Let's go to Cool Math and practice subtraction:
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20 Frank's water bottle can hold 22.2 oz of water. Tim's bottle can hold 13.5 oz. How much more water can Frank's bottle hold?
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21 Josh threw a ball 15.53 meters. Trish threw a ball 16.49 meters. What is the difference between the two distances?
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22 Dennis ran 7.5 miles in the same time that Rita ran 5.73 miles. How many more miles did Dennis run than Rita?
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23 McKenzie bought 14.32 gallons of gasoline. She used 9.63 gallons of gasoline on a trip to Jersey City. How much gasoline does McKenzie have left in her car?
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24 Donald weighted 192.4 pounds last year. He weighs 176.8 pounds this year. How much more did Donald weigh last year than this year?
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25 Maria ran the 200 meter dash in 29.152 seconds. Shelby ran the 200 meter dash in 28.901 seconds. How much longer did it take Maria to run the 200 meter dash than Shelby?
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26 The original price of a plasma TV was $3,695.99. Barry bought the TV on sale for $2,499.50. How much did Barry save?
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27 On Monday, it rained 1.25 inches. On Wednesday, it rained 1.92 inches. How much more rain fell Wednesday than Monday?
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Multiplication of Multi-Digit Numbers
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Steps: 3 26 5 4
x 6 3 9 2 4
Multiply the ones:6 x 4 = 24 (24>9 : so regroup)Regrouping 24:24 ones = 2 tens + 4 onesPut the 4 in the ones place of the answer and the 2
above the tens place.Multiply the tens:
6 X 5 = 30 (35>9 : so regroup)30 tens = 3 hundreds + 0 tensAdd 0 and the carried number. 0 + 2 = 2Put the 2 in the tens place of the answer and the 3above the hundreds place.
Multiply the hundreds:6 x 6 = 36 hundredsAdd 36 and the carried number. 36 + 3 = 39
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Steps: 3405
x 7 2835
Multiply the ones:7 x 5 = 35 (35>9 : so regroup)Regrouping 35:35 ones = 3 tens + 5 onesPut the 5 in the ones place of the answer and the 3 above
the tens place.Multiply the tens:
7 X 0 = 0 Add 0 and the carried number. 0 + 3 = 3Put the 3 in the tens place of the answer
Multiply the hundreds:7 x 4 = 28 hundreds
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28 59x 4
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29 572 x 3
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30 621 x 7
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31 359 x 9
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32 402 x 6
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Steps: 2 1 562 x 42
Multiply 562 x 2: 1124Multiply 562 x 40: + 22480Add two products: 23604
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Steps: 14 12
738 x 53
Multiply 738 x 3: 2214Multiply 738 x 50: + 36900Add two products: 39114
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33 73 x 42
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34 639 x 52
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35 704 x 19
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36 273 x 84
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37 4528 x 43
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Decimal Multiplication
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Multiply Decimals
To multiply two decimals:
1. Ignore the decimal points
2. Multiply the numbers
3. Count the total number of digits to the right of the decimal points
4. Put that many digits to the right of the decimal point in your answer
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Multiply Decimals
4.31x .03
.1293
There are a total of four digits to the right of the decimal points.
There must be four digits to the right of the decimal point in the answer.
}
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42.3x 0.23
1269
9.729
There are a total of three digits to the right of the decimal points.
There must be three digits to the right of the decimal point in the answer.
} + 8460
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38 Which answer has the decimal point in the correct location?
12.8 x 3
38438.43.84
A
BCD 0.38
4
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39 Which answer has the decimal point in the correct location?
64.2 x 0.43
276062.760627.606
A
BCD 276.06
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40 Which answer has the decimal point in the correct location?
0.518 x 12.4
0.642326.423264.232
A
BCD 642.32
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41 Which answer has the decimal point in the correct location?
6.142 x 34
20882820882.82088.28
A
BCD 208.82
8
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42 Solve
34.21 x 0.2
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43 Solve
34.8 x 0.6
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44 Solve
5.67 x 21
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45 Solve
346 x .43
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46 Solve
1.47 x .11
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47 Liam needs four boards to make a square frame. Each needs to be 14.75 inches long. What is the total length of boards he needs?
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48 Mrs. Fredricks want to buy matching sweaters for her seven grandchildren. The sweaters are $19.65 each. How much will she spend to buy all six?
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49 The path around the park is 315.36 yards long. Rachel wants to run 2.5 times around the path. How many yards will she run?
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Mixed Word Problems
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50 If you had five hundredths of a mile left to run, how would you write this distance as a decimal?
5.0.5.05
A
BCD 05.0E .50
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51 If you ran twelve and fifty six thousandths miles on one week, how would you write that?
12.56 miles12.056 miles12.0056 miles
A
BCD 12,56E 12.56
0
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52 You have $11.00. Do you have enough money to buy 4 highlighters for $1.85 each and one fancy pen for $2.65?
YesNo
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53 You have $11.00. How much will it cost to buy 4 highlighters for $1.85 each and one fancy pen for $2.65?
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54 Your weekly grocery bill averages $87.39. Round your total to the nearest 10 dollars to figure out approximately how much money to save for groceries per week.
$100.00
$90.00$87.00
A
BCD $80.00
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55 Your weekly grocery bill averages $87.39. Round your total to the nearest 10 dollars to figure out approximately how much money would you save for groceries per month.
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56 Jack won $35.00 for her science fair project. Her project cost $13.85 to prepare. How much did Sally actually make as a profit?
$22.85
$22.15$21.15
A
BCD $21.85
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57 Five students collected paper to be recycled. Shelly's stack was 3.2 cm. thick; Ken's stack was 1.08 cm. thick; Joe's stack was 4 cm. thick; Betty's stack was .75 cm. thick; Mary's stack was 2.4 cm. thick. What was the total thickness of the papers collected to be recycled?
243 cm.24.3 cm. 11.43 cm.
A
BCD 1143 cm.
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58 The regular price of a pair of jeans is $25.99. Mrs. Jones has four children for whom she must buy new jeans. The jeans are on sale for $19.95.
What would the total cost be of four pairs of jeans on sale?
$79.80$103.96$7,980
A
BCD $10,396
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59 The regular price of a pair of jeans is $25.99. Mrs. Jones has four children for whom she must buy new jeans. The jeans are on sale for $19.95.
How much money does she save buying the jeans on sale?
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60 Ricky had $75.25 in his savings account. After he withdrew some money he had $45.31 left. How much money did he withdraw?
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61 Victoria bought a taco for $3.25 and a drink for $1.29. If she paid with a $20 bill, how much change did she get back?
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62 Mary has $375.12 in her savings account. She deposits $14.52 and $68.10. What is her new balance?
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63 Paul has $255.50 in his savings account. Last month he withdrew $34.99 to buy a video game. Yesterday he deposited $50 in his account as a birthday gift. What is his new balance to his savings account?
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64 Thomas had a $20 bill when he went to the movies. He bought a ticket for $8.50, popcorn for $3.75 and a drink for $2.50. How much money did he have left after the movies?
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65 Don took aluminum cans to his local recycling center. He received $2.16 for 6 pounds, $2.52 for 7 pounds and $2.88 for 8 pounds of aluminum cans. How much money will he receive for 10 pounds of aluminum cans?
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66 Rosa buys a sweater for $21.99, gloves for $9.95 and a hat for $4.89. After making these purchases, she buys some heavy socks. In all, she spent m $41. What is the amount she paid for the socks?