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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 25 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 715 + 548 by rounding each number to the nearest ten, then work it out.
2.Estimate 142 + 407 by rounding each number to the nearest ten, then work it out.
3.Estimate 312 + 867 by rounding each number to the nearest ten, then work it out.
4.Estimate 111 + 513 by rounding each number to the nearest ten, then work it out.
5.Estimate 416 + 503 by rounding each number to the nearest ten, then work it out.
6.Estimate 827 + 253 by rounding each number to the nearest ten, then work it out.
7.Estimate 364 + 689 by rounding each number to the nearest ten, then work it out.
8.Estimate 809 + 267 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 25 · free to copy for classroom use

Answer key — Round then Estimate

Set 25. Prints on its own sheet.

  1. 1.about 1270; exactly 1263
  2. 2.about 550; exactly 549
  3. 3.about 1180; exactly 1179
  4. 4.about 620; exactly 624
  5. 5.about 920; exactly 919
  6. 6.about 1080; exactly 1080
  7. 7.about 1050; exactly 1053
  8. 8.about 1080; exactly 1076

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