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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 23 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 796 + 112 by rounding each number to the nearest ten, then work it out.
2.Estimate 763 + 491 by rounding each number to the nearest ten, then work it out.
3.Estimate 731 + 553 by rounding each number to the nearest ten, then work it out.
4.Estimate 454 + 481 by rounding each number to the nearest ten, then work it out.
5.Estimate 626 + 471 by rounding each number to the nearest ten, then work it out.
6.Estimate 828 + 415 by rounding each number to the nearest ten, then work it out.
7.Estimate 776 + 156 by rounding each number to the nearest ten, then work it out.
8.Estimate 545 + 886 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 23 · free to copy for classroom use

Answer key — Round then Estimate

Set 23. Prints on its own sheet.

  1. 1.about 910; exactly 908
  2. 2.about 1250; exactly 1254
  3. 3.about 1280; exactly 1284
  4. 4.about 930; exactly 935
  5. 5.about 1100; exactly 1097
  6. 6.about 1250; exactly 1243
  7. 7.about 940; exactly 932
  8. 8.about 1440; exactly 1431

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