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Multiplying by Powers of 10
Adding decimals
Multiplying decimals
Multiplying decimals again
Random
100

34 x 1000

34,000

100

When adding decimals, what must you do with the decimal points?

Line them up

100

When multiplying decimals (such as 1.2 times 3) how do you know where to put the decimal in your answer?

Add up the number of decimal places in all the factors. 

100

.7 x .4=

.28

100

Round the decimal to the given place-value. 5.031; hundredths

5.03

200

654 x 101

6540

200

4.9+3.0=

7.9

200

1.7 x 5 =

8.5

200

0.4 x 3.7 =

1.48

200

Round the decimal to the given place-value. 27.35; tens

30

300

34.36 x 100

3,436

300

7.2+9.5=

16.7

300

0.9 x 4 =

3.6

300

.52 x 2.1=

1.092

300

True or False:

When multiplying decimals, the amount of decimal places in your factors determines how many decimal places will be in your product.

True

400

607.53 x 103

607,530

400

.796+13

13.796

400

2.4 x 8 =

19.2

400

1.5 x 2.7 =

4.05

400

Ciera has four cats named Liam, Amy, Rose, and Sadie. The toy she wants to buy each cat costs $5.25. How much will Ciera spend if she buys all 4 of her cats this toy?

$21.00

500

5061.2 x 104

50,612,000

500

15.63+24.36=

39.99

500

.012 x 7 =

.084

500

.28 x .08 =

.0224

500

Avri spends 139.74 minutes a day talking to his friend Mason on the phone. How much time does Avri spend talking on the phone with Mason in ONE week?

978.18 minutes