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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 21 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 276 + 623 by rounding each number to the nearest ten, then work it out.
2.Estimate 626 + 390 by rounding each number to the nearest ten, then work it out.
3.Estimate 698 + 431 by rounding each number to the nearest ten, then work it out.
4.Estimate 156 + 551 by rounding each number to the nearest ten, then work it out.
5.Estimate 539 + 197 by rounding each number to the nearest ten, then work it out.
6.Estimate 367 + 811 by rounding each number to the nearest ten, then work it out.
7.Estimate 527 + 347 by rounding each number to the nearest ten, then work it out.
8.Estimate 674 + 509 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 21 · free to copy for classroom use

Answer key — Round then Estimate

Set 21. Prints on its own sheet.

  1. 1.about 900; exactly 899
  2. 2.about 1020; exactly 1016
  3. 3.about 1130; exactly 1129
  4. 4.about 710; exactly 707
  5. 5.about 740; exactly 736
  6. 6.about 1180; exactly 1178
  7. 7.about 880; exactly 874
  8. 8.about 1180; exactly 1183

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