Estimate Division Using Compatible Numbers

Now solve both compatible number equations

(write answer with a coma and no spaces. Ex. 10,3)

Use compatible numbers to solve:
4322 ÷ 81
(Get as close as you can to the original number!)

• 5

• 50

• 60

• 600

Use compatible numbers to solve:
2,740 ÷ 67

• 400

• 40

• 30

• 300

A school has 617 students Each class has between 28 and 32 students. Which of the following is a reasonable estimate of the number of classes in the school? (HINT: Estimate the number of students using a compatible number between 28 and 32.)

• 14 classes

• 30 classes

• 20 classes

• 60 classes

Use compatible numbers to estimate.

568 ÷ 34

• 570 ÷ 30 = 19

• 600 ÷ 30 = 20

• 500 ÷ 50 = 100

Use compatible numbers to estimate.

1,847 ÷ 24

• 2500 ÷ 25 = 100

• 1,850 ÷ 20 = 92.5

• 1,800 ÷ 20 = 90

When we estimate quotients we ______.

• use compatible numbers.

• round.

Use compatible numbers to estimate.

7,233 ÷ 84

• 8500 ÷ 85 = 100

• 7,200 ÷ 90 = 80

• 7,200 ÷ 80 = 90

Use compatible numbers to estimate.

4,479 ÷ 89

• 4,500 ÷ 90 = 50

• 4,400 ÷ 90 = 50

• 4,000 ÷ 100 = 40