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ADDITION ESTIMATION

Estimate sums using rounding to check if your answer makes sense.

L4L5
CS.N.3.3(III)CS.N.4.3(IV)
Section 1 / 3
ROUNDING TO ESTIMATE SUMS

Before you calculate, get a rough answer by rounding each number to the nearest ten (or hundred). This estimate tells you what ballpark the real answer should be in.

Estimate 47 + 34
1Round: 50 + 30 = 80
2Exact answer: 81
3Estimate was close!
= 81

LEADER TIP

Make estimation a daily warm-up. Ask 'Is this answer reasonable?' after every practice problem to build number sense.

BEFORE THIS LESSON, TRY

🏗️Place Value Addition

PRACTICE WITH THESE GAMES

�Guess the Number�Math Bingo🎯Addition Quiz

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