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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 17 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 794 + 511 by rounding each number to the nearest ten, then work it out.
2.Estimate 824 + 542 by rounding each number to the nearest ten, then work it out.
3.Estimate 372 + 884 by rounding each number to the nearest ten, then work it out.
4.Estimate 700 + 674 by rounding each number to the nearest ten, then work it out.
5.Estimate 106 + 188 by rounding each number to the nearest ten, then work it out.
6.Estimate 153 + 445 by rounding each number to the nearest ten, then work it out.
7.Estimate 192 + 586 by rounding each number to the nearest ten, then work it out.
8.Estimate 191 + 564 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 17 · free to copy for classroom use

Answer key — Round then Estimate

Set 17. Prints on its own sheet.

  1. 1.about 1300; exactly 1305
  2. 2.about 1360; exactly 1366
  3. 3.about 1250; exactly 1256
  4. 4.about 1370; exactly 1374
  5. 5.about 300; exactly 294
  6. 6.about 600; exactly 598
  7. 7.about 780; exactly 778
  8. 8.about 750; exactly 755

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