Estimating Decimal Division Techniques

In this video, Mr. J explains how to estimate decimal quotients using various strategies. The main focus is on rounding and finding compatible numbers to simplify division problems. The video covers different techniques for estimation, including rounding the divisor and identifying compatible numbers, and provides examples to illustrate these methods. The goal is to make estimation easier and more intuitive, allowing for quick calculations with minimal effort. The video concludes with a summary of the strategies discussed.

What is the main goal of estimation in math?

• To find the exact answer

• To find an approximate value

• To make the problem more complex

• To avoid solving the problem

When rounding the divisor 4.75 to the nearest whole number, what do you get?

• 4

• 4.8

• 5

• 6

Which of the following is a compatible number for 23.8 when dividing by 5?

• 20

• 22

• 30

• 25

What is the estimated quotient of 80.12 divided by 9.4 using the first strategy?

• 9

• 8

• 10

• 7

Using number sense, what compatible numbers can you use for 80.12 and 9.4?

• 79 and 9

• 80 and 10

• 81 and 10

• 80 and 9

What is the estimated quotient of 403.9 divided by 7.22 using the first strategy?

• 65

• 55

• 50

• 60

When estimating 403.9 divided by 7.22 using the second strategy, what compatible numbers can you use?

• 400 and 7

• 403 and 8

• 400 and 8

• 403 and 7

Why is rounding 19.17 to 19 not the best strategy for estimation?

• 19 is too large

• 19 is difficult to work with

• 19 is not a whole number

• 19 is too small

What is the estimated quotient of 592.6 divided by 19.17 when rounded to 20?

• 25

• 30

• 28

• 32

What is the exact answer for 592.6 divided by 19.17 rounded to the nearest hundredth?

• 30.50

• 29.85

• 31.00

• 30.91