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2nd grade estimating sums and differences worksheets

Your child rounds two-digit numbers to the nearest ten and picks the best estimate of a sum or difference, like 36 + 12 is about 50.

Common Core 2.NBT.B.5 (Number and Operations in Base Ten)

Sample problems

  1. Sample 1Round each number to the nearest ten. Which is the best estimate of 21 + 38?
    A. 60
    B. 70
    C. 50

    Answer: A

  2. Sample 2Round each number to the nearest ten. Which is the best estimate of 41 + 26?
    A. 60
    B. 80
    C. 70

    Answer: C

  3. A bit harderRound each number to the nearest ten. Which is the best estimate of 54 + 25?
    A. 90
    B. 70
    C. 80

    Answer: C

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Estimating sums and differences