DIVISION ESTIMATION

Use compatible numbers to estimate quotients before calculating exactly.

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CS.N.4.3·Estimating and verifying results(IV)

Section 1 / 3

COMPATIBLE NUMBERS

To estimate a division, find a nearby number that divides evenly - a compatible number. For 83 ÷ 9, think: 81 ÷ 9 = 9. The answer is about 9.

Estimate 83 / 9

1Think: what is close to 83 that divides nicely by 9?

281 / 9 = 9

3Estimate: about 9

= 9

LEADER TIP

Teach 'compatible numbers': for 153 ÷ 7, think 'What multiple of 7 is close to 153?' (147 = 7 x 21).

BEFORE THIS LESSON, TRY

PRACTICE WITH THESE GAMES

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