Decimal Operations

Adding Decimals

100

Do you line up decimals when you add?

yes

200

Add:

1.65 + 0.23 =

1.88

300

Add

23.99 + 6.99 = 

30.98

400

Add

204.15  +  1.29

205.44

500

Add

105 + 54.77 =

159.77 

Subtracting Decimals

100

Do you line up decimals when you subtract?

yes

200

Subtract:

50.00 - 15.25 =

34.75

300

subtract

3.50 - 1.20 = 

2.30

400

Subtract

75.88 - 3.44 =

72.44

500

subtract

100 - 33.55 =

66.45

Multiplying Decimals

100

Do you line up decimals when you multiply?

no

200

Multiply:

1. 32 x .2 =

0.264

300

Multiply: 

3.47 x 0.31

1.0757

400

multiply

10.5 x .02 =

0.21

500

multiply

4.65 x .5

2.325

Dividing Decimals

100

Divide:

26.5 / 5

5.3

200

Divide:

6 / 0.5

12

300

Divide:

291.6 / 6

48.6

400

divide

0.568 / 0.08

7.1

500

divide 

12.5 / 5

2.5

Place Value

100

True or False: 

The value of the 6 in 26.495 is 100 times the value of 6 in 17.64.

200

Which number(s) have a 5 that is 10 times the value of the 5 in 13.725?  Select the two correct answers.

• 5.368

• 12.459

• 57.31

• 6.508

• 4.315

• 7.65

(2) 12.459 &(6) 7.65

300

Clyde wrote this number: 352.867

Sheila wrote this number: 589.021

The digit 8 in Sheila’s number represents how many times as much as the digit 8 in Clyde’s number?

Sheila's 8 is 10x greater than Clyde's 8

400

Write a number where the value of 8  is  10 times greater than the value of 8 in 6.582. 

You may only use one 8 in your answer.

Any number where the 8 is in the tenths place. 

Ex: 6.8 , 5.8 , 3.8

500

What is the relationship between the 3s in 3.032?  

Use place value terms in your answer.

The relationship between the 3's is that the 3 in the ones place is 100x greater than the 3 in the hundredths place. 

Also, the 3 in the hundredths place is 1/100 of or 100x less than the 3 in the ones place.