Estimating Quotients

What is the best way to change these numbers to make them FRIENDLY for estimation?

• 630 ÷ 8

• 640 ÷ 8

• 610 ÷ 8

• 600 ÷ 8

What is the best way to change these numbers to make them FRIENDLY for estimation?

• 800 ÷ 9

• 840 ÷ 9

• 810 ÷ 9

• 830 ÷ 9

Tags

CCSS.5.NBT.B.6

What is the best way to change these numbers to make them FRIENDLY for estimation?

• 680 ÷ 10

• 680 ÷ 9

• 670 ÷ 9

• 690 ÷ 9

What is the best way to change these numbers to make them FRIENDLY for estimation?

• 4000 ÷ 21

• 4000 ÷ 20

• 4200 ÷ 22

• 4250 ÷ 20

What is the best way to change these numbers to make them FRIENDLY for estimation?

• 5800 ÷ 60

• 5800 ÷ 62

• 5400 ÷ 60

• 6000 ÷ 62

What is the best way to change these numbers to make them FRIENDLY for estimation?

• 2700 ÷ 30

• 2000 ÷ 30

• 3000 ÷ 33

• 2700 ÷ 33

Based on our rules for rounding, which is the best example of a good estimate for 562 x 41?

• 560 x 40
• 500 x 40
• 600 x 40
• 600 x 50

Which of the following is a good example of estimating to solve for the product of 2,019 x 391?

• 2,000 x 390

• 2,000 x 400

• 2,020 x 400

• 2,020 x 300

Answer explanation

Estimating to solve for the product of 2,019 x 391 is best done by rounding to the nearest hundreds. The correct choice, 2,000 x 400, is the closest estimate.

Why do we estimate numbers?

• We estimate because our math teachers say so.
• Estimating is on the STAAR test.
• Estimating makes math calculations easier.
• We estimate because it makes math more difficult.

If you are estimating 92 x 12, which expression would be best to use?

• 100 x 20
• 100 x 30
• 90 x 12
• 90 x 10