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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 12 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 385 + 341 by rounding each number to the nearest ten, then work it out.
2.Estimate 841 + 779 by rounding each number to the nearest ten, then work it out.
3.Estimate 518 + 539 by rounding each number to the nearest ten, then work it out.
4.Estimate 494 + 515 by rounding each number to the nearest ten, then work it out.
5.Estimate 346 + 577 by rounding each number to the nearest ten, then work it out.
6.Estimate 630 + 861 by rounding each number to the nearest ten, then work it out.
7.Estimate 173 + 241 by rounding each number to the nearest ten, then work it out.
8.Estimate 567 + 733 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 12 · free to copy for classroom use

Answer key — Round then Estimate

Set 12. Prints on its own sheet.

  1. 1.about 730; exactly 726
  2. 2.about 1620; exactly 1620
  3. 3.about 1060; exactly 1057
  4. 4.about 1010; exactly 1009
  5. 5.about 930; exactly 923
  6. 6.about 1490; exactly 1491
  7. 7.about 410; exactly 414
  8. 8.about 1300; exactly 1300

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