Multiplying Decimals

Multiplying Decimals

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How to multiply decimals

• To multiply by a decimal number, remove the decimal point(s)

  and multiply as if the numbers were whole numbers.

• Then, move the decimal point in the product one space

  to the left for each decimal place in the original problem.

Multiple Choice

7.12 x 3 =

•  21.36 
• 213.6
• 21.49
• 214.9

Multiple Choice

7.13 x 5.5 

• 39.215
• 3.9215
• 392.15
• 3921.5

Multiple Choice

Michael purchases 12 pencils at the school bookstore. They cost $0.35 each. How much did he spend on pencils?

• $3.23

• $2.80

• $4.20

• $30.00

Multiple Choice

Sarah jogged 4.8 miles each day for 22 days last month.  How many miles did Sarah jog in total?

• 110 miles
• 105.6 miles
• 88.16 miles
• 26.8 miles

Decimals within Track

Finding how long it will take each runner to run 400m race given their 100m finishing time

Multiple Choice

Sha' Carri Richardson ran 100 m in 10.86 how long will it take her to run 400m at the same speed.

• 20 seconds

• 54.3 seconds

• 43.44 seconds

• 60 seconds

Multiple Choice

Javianne Oliver ran 100 m in 10.99 how long will it take her to run 400m at the same speed.

• 34.78 seconds

• 43.96 seconds

• 67.89 seconds

• 72.43 seconds