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Round then Estimate is a free printable Grade 3 maths worksheet on using rounding to check an answer, aligned to Common Core standard 3.NBT.A.1. It prints 12 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils 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

Round each number.

1.Round 519 to the nearest ten
2.Round 645 to the nearest ten
3.Round 262 to the nearest ten
4.Round 888 to the nearest ten
5.Round 353 to the nearest ten
6.Round 943 to the nearest ten
7.Round 244 to the nearest ten
8.Round 108 to the nearest ten
9.Round 850 to the nearest ten
10.Round 883 to the nearest ten
11.Round 678 to the nearest ten
12.Round 517 to the nearest ten

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. 1.520
  2. 2.650
  3. 3.260
  4. 4.890
  5. 5.350
  6. 6.940
  7. 7.240
  8. 8.110
  9. 9.850
  10. 10.880
  11. 11.680
  12. 12.520

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