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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 10 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 841 + 393 by rounding each number to the nearest ten, then work it out.
2.Estimate 174 + 250 by rounding each number to the nearest ten, then work it out.
3.Estimate 162 + 366 by rounding each number to the nearest ten, then work it out.
4.Estimate 829 + 522 by rounding each number to the nearest ten, then work it out.
5.Estimate 288 + 695 by rounding each number to the nearest ten, then work it out.
6.Estimate 811 + 139 by rounding each number to the nearest ten, then work it out.
7.Estimate 107 + 467 by rounding each number to the nearest ten, then work it out.
8.Estimate 731 + 801 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 10 · free to copy for classroom use

Answer key — Round then Estimate

Set 10. Prints on its own sheet.

  1. 1.about 1230; exactly 1234
  2. 2.about 420; exactly 424
  3. 3.about 530; exactly 528
  4. 4.about 1350; exactly 1351
  5. 5.about 990; exactly 983
  6. 6.about 950; exactly 950
  7. 7.about 580; exactly 574
  8. 8.about 1530; exactly 1532

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