Estimating Using Compatible Numbers

Which numbers are compatible to find an estimated quotient?

• 660 ÷ 50

• 5,100 ÷ 110

• 72,000 ÷ 80

• 240 ÷ 9

Which numbers are compatible to find an estimated quotient?

• 90,000 ÷ 3000

• 55,000 ÷ 60

• 800 ÷ 9

• 3,200 ÷ 70

251 ÷ 63 =

If 63 is rounded to 60, what number should 251 be rounded to which would make the BEST compatible number?

? ÷ 60 =

• 240

• 250

• 260

• 300

453 ÷ 54

If the divisor, 54, is rounded to 50, what is the BEST compatible number to round 453 to?

? ÷ 50 =

• 400

• 450

• 455

• 500

Part A:

What numbers are the BEST compatible numbers to estimate the quotient of this equation?

609 ÷ 21

• 610 ÷ 20

• 600 ÷ 20

• 650 ÷ 25

• 700 ÷ 21

Part B:

What would the estimated quotient be?

609 ÷ 21 =

• 40

• 3

• 30

• 300

Part A:

What would be the BEST compatible numbers to estimate the quotient of this equation?

913 ÷ 29 =

• 900 ÷ 30

• 915 ÷ 25

• 950 ÷ 25

• 910 ÷ 20

Part B:

What would the estimated quotient be?

913 ÷ 29 =

• 2,700

• 3

• 27,000

• 30

Part A:

What would be the BEST compatible numbers to estimate the quotient of this equation?

5,396 ÷ 62 =

• 5,500 ÷ 55

• 6000 ÷ 60

• 5,300 ÷ 65

• 5,400 ÷ 60

Part B:

What would the estimated quotient be?

5,396 ÷ 62 =

• 60

• 90

• 600

• 900