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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 7 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 744 + 668 by rounding each number to the nearest ten, then work it out.
2.Estimate 871 + 867 by rounding each number to the nearest ten, then work it out.
3.Estimate 806 + 265 by rounding each number to the nearest ten, then work it out.
4.Estimate 109 + 399 by rounding each number to the nearest ten, then work it out.
5.Estimate 501 + 448 by rounding each number to the nearest ten, then work it out.
6.Estimate 893 + 849 by rounding each number to the nearest ten, then work it out.
7.Estimate 819 + 297 by rounding each number to the nearest ten, then work it out.
8.Estimate 525 + 117 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 7 · free to copy for classroom use

Answer key — Round then Estimate

Set 7. Prints on its own sheet.

  1. 1.about 1410; exactly 1412
  2. 2.about 1740; exactly 1738
  3. 3.about 1080; exactly 1071
  4. 4.about 510; exactly 508
  5. 5.about 950; exactly 949
  6. 6.about 1740; exactly 1742
  7. 7.about 1120; exactly 1116
  8. 8.about 650; exactly 642

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