Estimate Division with Compatible Numbers

Use compatible numbers to estimate.

7,233 ÷ 84

• 8500 ÷ 85 = 100

• 7,200 ÷ 90 = 80

• 7,200 ÷ 80 = 90

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

At the recycling center, 394 cans are to be organized into 10 green bins, and 560 bottles are to be organized into 12 blue bins. Use estimation to decide which type of bin has more items. About how many items are in this bin?

• blue bin, 60

• blue bin, 40

• green bin, 60

• green bin, 40

Cameron wants to buy a bike for $268. He saves $53 each month from his job. Which is the best estimate of the number of months it will take him to save enough to buy the bike?

• 150 ÷ 50 = 3 months

• 300 ÷ 60 = 5 months

• 300 ÷ 50 = 6 months

• 240 ÷ 60 = 4 months

When estimating with division, you should

• find compatible numbers closest to the original numbers and divide

• Round to the nearest ten and divide no matter what

• just divide

• ?

Compatible numbers are:

• Fake numbers

• Numbers you make up

• Numbers that help make math easier and are friendly

• Numbers that hold hands

Erin has 598 goldfish to split between 22 fish tanks. About how many goldfish are in each tank? Choose the best answer

• 3 goldfish in each tank

• 20 goldfish in each tank

• 12 goldfish in each tank

• 30 goldfish in each tank

When estimating 372 divided by 41, it should be changed to

• 400 divided by 40

• 360 divided by 40

• 370 divided by 50

• 300 divided by 50