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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 16 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 107 + 826 by rounding each number to the nearest ten, then work it out.
2.Estimate 478 + 477 by rounding each number to the nearest ten, then work it out.
3.Estimate 339 + 327 by rounding each number to the nearest ten, then work it out.
4.Estimate 346 + 707 by rounding each number to the nearest ten, then work it out.
5.Estimate 757 + 514 by rounding each number to the nearest ten, then work it out.
6.Estimate 781 + 309 by rounding each number to the nearest ten, then work it out.
7.Estimate 274 + 527 by rounding each number to the nearest ten, then work it out.
8.Estimate 111 + 511 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 16 · free to copy for classroom use

Answer key — Round then Estimate

Set 16. Prints on its own sheet.

  1. 1.about 940; exactly 933
  2. 2.about 960; exactly 955
  3. 3.about 670; exactly 666
  4. 4.about 1060; exactly 1053
  5. 5.about 1270; exactly 1271
  6. 6.about 1090; exactly 1090
  7. 7.about 800; exactly 801
  8. 8.about 620; exactly 622

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