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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 13 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 418 + 585 by rounding each number to the nearest ten, then work it out.
2.Estimate 705 + 596 by rounding each number to the nearest ten, then work it out.
3.Estimate 209 + 731 by rounding each number to the nearest ten, then work it out.
4.Estimate 630 + 791 by rounding each number to the nearest ten, then work it out.
5.Estimate 207 + 443 by rounding each number to the nearest ten, then work it out.
6.Estimate 122 + 535 by rounding each number to the nearest ten, then work it out.
7.Estimate 580 + 207 by rounding each number to the nearest ten, then work it out.
8.Estimate 628 + 607 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 13 · free to copy for classroom use

Answer key — Round then Estimate

Set 13. Prints on its own sheet.

  1. 1.about 1010; exactly 1003
  2. 2.about 1310; exactly 1301
  3. 3.about 940; exactly 940
  4. 4.about 1420; exactly 1421
  5. 5.about 650; exactly 650
  6. 6.about 660; exactly 657
  7. 7.about 790; exactly 787
  8. 8.about 1240; exactly 1235

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