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Round then Estimate is a free printable Grade 3 math worksheet on using rounding to check an answer, aligned to Common Core standard 3.NBT.A.1. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 4 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Round then Estimate

3.NBT.A.1

NameDate

Estimate first, then work it out.

1.Estimate 774 + 300 by rounding each number to the nearest ten, then work it out.
2.Estimate 377 + 456 by rounding each number to the nearest ten, then work it out.
3.Estimate 511 + 476 by rounding each number to the nearest ten, then work it out.
4.Estimate 550 + 136 by rounding each number to the nearest ten, then work it out.
5.Estimate 126 + 478 by rounding each number to the nearest ten, then work it out.
6.Estimate 598 + 294 by rounding each number to the nearest ten, then work it out.
7.Estimate 321 + 100 by rounding each number to the nearest ten, then work it out.
8.Estimate 731 + 204 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 4 · free to copy for classroom use

Answer key — Round then Estimate

Set 4. Prints on its own sheet.

  1. 1.about 1070; exactly 1074
  2. 2.about 840; exactly 833
  3. 3.about 990; exactly 987
  4. 4.about 690; exactly 686
  5. 5.about 610; exactly 604
  6. 6.about 890; exactly 892
  7. 7.about 420; exactly 421
  8. 8.about 930; exactly 935

Last reviewed 2026-09-05. Aligned to 3.NBT.A.1 of the Common Core State Standards for Mathematics.