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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 15 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 379 + 613 by rounding each number to the nearest ten, then work it out.
2.Estimate 117 + 858 by rounding each number to the nearest ten, then work it out.
3.Estimate 103 + 391 by rounding each number to the nearest ten, then work it out.
4.Estimate 866 + 444 by rounding each number to the nearest ten, then work it out.
5.Estimate 387 + 624 by rounding each number to the nearest ten, then work it out.
6.Estimate 199 + 120 by rounding each number to the nearest ten, then work it out.
7.Estimate 428 + 619 by rounding each number to the nearest ten, then work it out.
8.Estimate 378 + 688 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 15 · free to copy for classroom use

Answer key — Round then Estimate

Set 15. Prints on its own sheet.

  1. 1.about 990; exactly 992
  2. 2.about 980; exactly 975
  3. 3.about 490; exactly 494
  4. 4.about 1310; exactly 1310
  5. 5.about 1010; exactly 1011
  6. 6.about 320; exactly 319
  7. 7.about 1050; exactly 1047
  8. 8.about 1070; exactly 1066

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