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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 3 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 416 + 893 by rounding each number to the nearest ten, then work it out.
2.Estimate 530 + 808 by rounding each number to the nearest ten, then work it out.
3.Estimate 807 + 694 by rounding each number to the nearest ten, then work it out.
4.Estimate 400 + 347 by rounding each number to the nearest ten, then work it out.
5.Estimate 130 + 460 by rounding each number to the nearest ten, then work it out.
6.Estimate 466 + 321 by rounding each number to the nearest ten, then work it out.
7.Estimate 724 + 794 by rounding each number to the nearest ten, then work it out.
8.Estimate 526 + 484 by rounding each number to the nearest ten, then work it out.

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

Answer key — Round then Estimate

Set 3. Prints on its own sheet.

  1. 1.about 1310; exactly 1309
  2. 2.about 1340; exactly 1338
  3. 3.about 1500; exactly 1501
  4. 4.about 750; exactly 747
  5. 5.about 590; exactly 590
  6. 6.about 790; exactly 787
  7. 7.about 1510; exactly 1518
  8. 8.about 1010; exactly 1010

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