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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 9 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 875 + 109 by rounding each number to the nearest ten, then work it out.
2.Estimate 567 + 580 by rounding each number to the nearest ten, then work it out.
3.Estimate 551 + 744 by rounding each number to the nearest ten, then work it out.
4.Estimate 436 + 606 by rounding each number to the nearest ten, then work it out.
5.Estimate 675 + 293 by rounding each number to the nearest ten, then work it out.
6.Estimate 702 + 140 by rounding each number to the nearest ten, then work it out.
7.Estimate 202 + 668 by rounding each number to the nearest ten, then work it out.
8.Estimate 144 + 744 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 9 · free to copy for classroom use

Answer key — Round then Estimate

Set 9. Prints on its own sheet.

  1. 1.about 990; exactly 984
  2. 2.about 1150; exactly 1147
  3. 3.about 1290; exactly 1295
  4. 4.about 1050; exactly 1042
  5. 5.about 970; exactly 968
  6. 6.about 840; exactly 842
  7. 7.about 870; exactly 870
  8. 8.about 880; exactly 888

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