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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 18 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 488 + 229 by rounding each number to the nearest ten, then work it out.
2.Estimate 862 + 623 by rounding each number to the nearest ten, then work it out.
3.Estimate 434 + 524 by rounding each number to the nearest ten, then work it out.
4.Estimate 264 + 605 by rounding each number to the nearest ten, then work it out.
5.Estimate 260 + 803 by rounding each number to the nearest ten, then work it out.
6.Estimate 775 + 790 by rounding each number to the nearest ten, then work it out.
7.Estimate 345 + 548 by rounding each number to the nearest ten, then work it out.
8.Estimate 409 + 872 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 18 · free to copy for classroom use

Answer key — Round then Estimate

Set 18. Prints on its own sheet.

  1. 1.about 720; exactly 717
  2. 2.about 1480; exactly 1485
  3. 3.about 950; exactly 958
  4. 4.about 870; exactly 869
  5. 5.about 1060; exactly 1063
  6. 6.about 1570; exactly 1565
  7. 7.about 900; exactly 893
  8. 8.about 1280; exactly 1281

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