Multiplying Decimals Review

Multiplying Decimals Review

By Shaunna Fortier

• When multiplying by powers of ten, the decimal point moves to the right.

• The number of times the digit moves depends on the number of zeros or the exponent.

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Multiplying by Powers of Ten

Multiple Choice

• A

• B

• C

• D

Multiple Choice

Choose the correct answer.

• A

• B

• C

• D

Multiple Choice

Choose the correct answer.

• A

• B

• C

• D

Multiple Select

Choose the three correct answers.

• 7/100 x 41/100

• 41/100 x 7/10

• 70/100 x 41/100

• 7/10 x 41/100

• 41/10 x 7/10

We can estimate the product by rounding one or both factors to the nearest whole and finding the approximate answer.

​

6.94 rounds to 7

3.8 rounds to 4

7 x 4 = 28

Therefore, the product of 6.94 and 3.8 should be around 28​

Estimation:

Multiple Choice

Estimate:

2.8 x 6.3

• 12

• 9

• 18

• 8

Multiple Choice

Estimate:

0.92 x 3.6

• 3

• 4

• 5

• 1

Multiple Choice

Estimate:

4.87 x 8.23

• 13

• 32

• 36

• 40

Multiple Choice

Choose the correct answer.

• $9

• $12

• $15

• $16

We can predict how many digits will be behind the decimal in the product by looking at how many digits are behind the decimals in the factors.

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There are 2 digits behind the decimal in 6.94

There is 1 digit behind the decimal in 3.8

Therefore,​ there should be 3 digits behind the decimal in our product (UNLESS IT ENDS IN ZERO!)

Digits:

Multiple Choice

0.67 x 0.5

• 0.335

• 3.35

• 33.5

• 335

Multiple Choice

1.18 x 2.6

• 3,068

• 3.68

• 3.068

• 36.8

Multiple Choice

0.72 X 5

• 0.36

• 3.6

• 36

• 0.036

Multiplying Decimals with Models

Multiple Choice

Choose the correct answer.

• A

• B

• C

• D

Multiple Choice

Choose the correct answer.

• A

• B

• C

• D

Multiple Choice

Choose the correct answer.

• A

• B

• C

• D

Open Ended

What are some key words that tell us to multiply in word problems?

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