Estimating Products with Rounding Techniques

Adele Kumar teaches how to estimate products of decimal numbers using various examples. The video covers four examples, demonstrating different estimation techniques such as rounding and approximation. Viewers are encouraged to try practice questions and verify their estimates with a calculator. The video aims to help learners understand how to make accurate estimates of decimal products.

What is the estimated product of 3.5 and 12 using the method of multiplying 3 by 12 and adding half of 12?

• 48

• 36

• 42

• 54

Which of the following is a correct estimation approach for 3.5 times 12?

• Multiply 3 by 12 and add 3

• Multiply 4 by 12 and subtract 3

• Multiply 3 by 12 and add half of 12

• Multiply 3 by 12 and subtract half of 12

What is the estimated product of 3.5 and 12 if you consider the number between 3 times 12 and 4 times 12?

• 48

• 36

• 40

• 42

How can you estimate the product of 4.2 and 8.1?

• Round to 4 and 8, then add 1

• Round to 5 and 9, then subtract 1

• Round to 4 and 9, then add 2

• Round to 5 and 8, then subtract 2

Which method involves rounding numbers to the nearest whole number before estimating their product?

• Balancing increases and decreases

• Rounding and adjusting

• Exact calculation

• Higher approximations

What is the estimated product of 4.2 and 8.1 if you round to the nearest whole numbers and add an extra?

• 32

• 30

• 33

• 35

What is the estimated product of 4.2 and 8.1 if you round to 4 and 8 and add an extra?

• 30

• 35

• 32

• 33

What is the estimated product of 4.2 and 8.1 if you round to 4 and 8?

• 32

• 35

• 30

• 33

What is the estimated product of 4.2 and 8.1 if you round to 4 and 8 and add an extra?

• 35

• 33

• 32

• 30

What is the estimated product of 3.9 and 5.2 using approximation?

• 30

• 15

• 20

• 25