Multiply Decimals Using the Standard Algorithm

Multiply Decimals Using the Standard Algorithm

How to Multiply Decimals

• Estimate your answer

• Stack the numbers with the longest factor on top- DO NOT LINE UP THE DECIMALS

• Ignore the decimals and multiply normally

• Underline decimal places in the factors and put the decimal in the product

• Use the estimate to check your work!!!!

Complete these practice problems

click on the video and complete these problems to practice!!!

Practice Problems

Use the standard algorithm to solve each of these problems

Make sure that you make a “smart” estimate first!!

Be careful where you put the decimal!

Multiple Choice

What is the best estimate for this number?

• 2

• 24

• 40

• 10

Multiple Choice

What is the exact answer?

• 24.28

• 25.28

• 26.28

• 27.28

Multiple Choice

What is the best estimate for this problem?

• 72

• 100

• 50

• 16

Multiple Choice

What is the best estimate for this problem?

• $75

• $200

• $280

• $320

Multiple Choice

What is the exact answer to this problem?

• 279.96

• 289.96

• 276.66

• 73.96

Multiple Choice

What is the exact answer to this problem?

• 16.75

• 60.00

• 70.00

• 75.00