Understanding Decimal Multiplication and Estimation

The video tutorial explains how to solve decimal multiplication problems by leveraging known whole number products. It demonstrates the process of moving the decimal point by dividing by 10 and using estimation techniques to approximate products. The tutorial provides examples to illustrate these concepts, helping learners understand how to apply these methods to solve similar problems.

What is the product of 427 and 23?

• 8,921

• 7,821

• 9,821

• 10,821

How do you convert 427 to 42.7?

• Multiply by 10

• Subtract 10

• Divide by 10

• Add 10

What is the estimated product of 40 and 2?

• 80

• 70

• 90

• 60

What is the product of 527 and 63?

• 32,201

• 30,201

• 33,201

• 31,201

How do you convert 527 to 52.7?

• Divide by 10

• Subtract 10

• Add 10

• Multiply by 10

What is the estimated product of 50 and 60?

• 2,000

• 5,000

• 3,000

• 4,000

If you divide 33,201 by 10, what is the result?

• 3,201.1

• 3,320.1

• 3,321.1

• 3,310.1

What is the purpose of moving the decimal point in these problems?

• To decrease the product

• To make the numbers whole

• To increase the product

• To adjust the scale of the numbers

Why is estimation used in these problems?

• To check the reasonableness of the answer

• To find the exact answer

• To avoid using decimals

• To make the problem harder

What is the key concept used to solve both Sydney's and Dom's problems?

• Subtraction

• Multiplication by 10

• Addition

• Decimal adjustment