MathematiCat

3rd grade estimating sums and differences worksheets

Your child rounds numbers to the nearest ten or hundred and picks the best estimate of a sum or difference, including totals from a table.

Common Core 3.OA.D.8 (Operations and Algebraic Thinking)

Sample problems

  1. Sample 1The table shows how many seats were filled at each show of the spring concert. About how many seats were filled at the shows in all?
    A. 1,000 seats
    B. 600 seats
    C. 900 seats
    D. 800 seats

    Answer: A

  2. Sample 2Round each number to the nearest ten. Which is the best estimate of 12 + 47?
    A. 70
    B. 60
    C. 50
    D. 59

    Answer: B

  3. A bit harderThe table shows how many cans each class collected for the recycling drive. About how many cans did the classes collect in all?
    A. 600 cans
    B. 800 cans
    C. 900 cans
    D. 700 cans

    Answer: B

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Estimating sums and differences