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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 6 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 721 + 811 by rounding each number to the nearest ten, then work it out.
2.Estimate 665 + 580 by rounding each number to the nearest ten, then work it out.
3.Estimate 590 + 480 by rounding each number to the nearest ten, then work it out.
4.Estimate 687 + 861 by rounding each number to the nearest ten, then work it out.
5.Estimate 171 + 856 by rounding each number to the nearest ten, then work it out.
6.Estimate 543 + 808 by rounding each number to the nearest ten, then work it out.
7.Estimate 615 + 314 by rounding each number to the nearest ten, then work it out.
8.Estimate 674 + 230 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 6 · free to copy for classroom use

Answer key — Round then Estimate

Set 6. Prints on its own sheet.

  1. 1.about 1530; exactly 1532
  2. 2.about 1250; exactly 1245
  3. 3.about 1070; exactly 1070
  4. 4.about 1550; exactly 1548
  5. 5.about 1030; exactly 1027
  6. 6.about 1350; exactly 1351
  7. 7.about 930; exactly 929
  8. 8.about 900; exactly 904

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