Welcome to Fifth Third Bank

Date Description of Transaction

Payment

Debit (-)

Deposit

Credit (+)

Balance

Jun 24 Opening Deposit 200.00 200.00

200.00

Jul 4 Buy Beach Towel 14.99 -14.99

50.10

Aug 3 School Supplies 28.03 -28.03

22.07

Aug 30 Back to School Dance 6.00 -6.00

16.07

Sep 12 Progress Report Money 10.00 +10.00

26.07

Mr. Stewart’s Checkbook

Date Description of Transaction

Payment

Debit (-)

Deposit

Credit (+)

Balance

Jun 24 Opening Deposit 200.00 200.00

200.00

Jul 4 Buy Beach Towel 14.99 14.99

185.01

Aug 3 School Supplies 28.03 28.03

156.98

Aug 30 Back to School Dance 6.00 6.00

150.98

Sep 12 Progress Report Money

10.00 10.00

160.98

3.3 Adding and Subtracting Decimals

I can add and subtract decimals and use estimation to check my answers

Adding or Subtracting Decimals

What do you do when you are adding or subtracting decimals?

Line’em UpDrop’em Down

Think about it…. Why is it important to line up your

decimals? Why do we add zeros?

3.3 Adding and Subtracting Decimals

I can add and subtract decimals and use estimation to check my answers

Adding or Subtracting

9.900

9.500

9.826

+ 8.120

37.346

Line up decimals. Add zeros as place

holders. Add. Bring the decimal

down from the problem.

9.9 + 9.5 + 9.826 + 8.12 = ?

Subtracting Example: 5 – 0.64 = ?

Line up decimals. Add the decimal point

to the whole number 5.

Add zeros as place holders.

Subtract. Bring the decimal down from the problem.

5.00

- 0.64

4.36

Estimate by rounding to the nearest whole number

Estimate by rounding to the nearest whole number.

9.7 + 9.3 + 9.45

My estimation is 28 10 + 9 + 9 = 28

Find the sum of 9.7, 9.3, and 9.45.

Additional Example 1A Continued

Add.

9.70

9.30

+9.4528.45

Align the decimal points.

Use zeros as placeholders.

Add. Then place the decimal point.

Since 28.45 is close to the estimate of 28, the answer is reasonable.

Examples:

1. 12 – 10.12 = ?

1.88

2. 3.8 + 0.7 = ?

4.5

3. 6 - 1.12 = ?

4.88

Estimation Why is estimation a good way to check

your answers? How else could you check your answers?

Learning Centers Showdown!

Problem Solving Samantha is balancing her checkbook.

The balance from her last statement was $213.33. Since than she made 1 deposit of $42.05 and wrote 1 check for $28.33. How much money does Samantha have left in her account?

You go to Falcon Flight and buy popcorn for $1.35, a soda for $1.20 and a slice of pizza for $2.33. You pay with a $5.00 bill. Write an equation to show how much change you will receive. Let c = the change you get back $5.00 – (1.35 + 1.20 + 2.33) = C 1.35 + 1.20 + 2.33 + c = 5.00 C=$0.12

Examples:

4. 6.5 + 12.12 = ?

18.62

5. 7 +15.876 + 0.56 = ?

23.436

6. 44.587 + 7.023 + 5 = ?

56.61

Examples:

7. 44.98 – 14.32 = ?

30.66

8. 8 – 3.56 = ?

4.44