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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 11 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 421 + 520 by rounding each number to the nearest ten, then work it out.
2.Estimate 249 + 333 by rounding each number to the nearest ten, then work it out.
3.Estimate 484 + 550 by rounding each number to the nearest ten, then work it out.
4.Estimate 118 + 491 by rounding each number to the nearest ten, then work it out.
5.Estimate 204 + 544 by rounding each number to the nearest ten, then work it out.
6.Estimate 254 + 874 by rounding each number to the nearest ten, then work it out.
7.Estimate 818 + 130 by rounding each number to the nearest ten, then work it out.
8.Estimate 290 + 232 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 11 · free to copy for classroom use

Answer key — Round then Estimate

Set 11. Prints on its own sheet.

  1. 1.about 940; exactly 941
  2. 2.about 580; exactly 582
  3. 3.about 1030; exactly 1034
  4. 4.about 610; exactly 609
  5. 5.about 740; exactly 748
  6. 6.about 1120; exactly 1128
  7. 7.about 950; exactly 948
  8. 8.about 520; exactly 522

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