Estimating Quotients with Compatible Numbers

Estimate 104.3 ÷ 4.2

What is a good option for a compatible number for 107.2?

Use compatible numbers to estimate.

7,233 ÷ 84

• 8500 ÷ 85 = 100

• 7,200 ÷ 90 = 80

• 7,200 ÷ 80 = 90

Use compatible numbers to estimate.

568 ÷ 34

• 570 ÷ 30 = 19

• 600 ÷ 30 = 20

• 500 ÷ 50 = 100

Use compatible numbers to estimate.

4,479 ÷ 89

• 4,500 ÷ 90 = 50

• 4,400 ÷ 90 = 50

• 4,000 ÷ 100 = 40

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.

Alec needs to save $376. He plans to rake fall leaves for $12 per lawn. Using compatible numbers, write an estimate that shows the number of lawns he will need to rake.

• $400÷$10

• $370÷$12

Which number sentence with compatible numbers is the most reasonable estimate of the quotient for 478 ÷ 47?

• 500 ÷ 25 = 20

• 500 ÷ 50 = 10

• 400 ÷ 50 = 8

• 600 ÷ 40 = 15

Leo has 279 comic books in his collection. He puts 34 comic books in each box. About how many boxes of comic books does Leo have?

• 6

• 11

• 9

• 5