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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 24 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 505 to the nearest ten
2.Round 181 to the nearest ten
3.Round 298 to the nearest ten
4.Round 506 to the nearest ten
5.Round 135 to the nearest ten
6.Round 821 to the nearest ten
7.Round 260 to the nearest ten
8.Round 132 to the nearest ten
9.Round 421 to the nearest ten
10.Round 594 to the nearest ten
11.Round 561 to the nearest ten
12.Round 680 to the nearest ten

LessonPrint · 3.NBT.A.1 · Set 24 · free to copy for classroom use

Answer key — Round then Estimate

Set 24. Prints on its own sheet.

  1. 1.510
  2. 2.180
  3. 3.300
  4. 4.510
  5. 5.140
  6. 6.820
  7. 7.260
  8. 8.130
  9. 9.420
  10. 10.590
  11. 11.560
  12. 12.680

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