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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 20 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 350 + 171 by rounding each number to the nearest ten, then work it out.
2.Estimate 734 + 403 by rounding each number to the nearest ten, then work it out.
3.Estimate 830 + 271 by rounding each number to the nearest ten, then work it out.
4.Estimate 680 + 111 by rounding each number to the nearest ten, then work it out.
5.Estimate 693 + 784 by rounding each number to the nearest ten, then work it out.
6.Estimate 171 + 627 by rounding each number to the nearest ten, then work it out.
7.Estimate 657 + 824 by rounding each number to the nearest ten, then work it out.
8.Estimate 593 + 296 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 20 · free to copy for classroom use

Answer key — Round then Estimate

Set 20. Prints on its own sheet.

  1. 1.about 520; exactly 521
  2. 2.about 1130; exactly 1137
  3. 3.about 1100; exactly 1101
  4. 4.about 790; exactly 791
  5. 5.about 1470; exactly 1477
  6. 6.about 800; exactly 798
  7. 7.about 1480; exactly 1481
  8. 8.about 890; exactly 889

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