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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 2 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 788 + 483 by rounding each number to the nearest ten, then work it out.
2.Estimate 236 + 446 by rounding each number to the nearest ten, then work it out.
3.Estimate 372 + 459 by rounding each number to the nearest ten, then work it out.
4.Estimate 672 + 460 by rounding each number to the nearest ten, then work it out.
5.Estimate 698 + 828 by rounding each number to the nearest ten, then work it out.
6.Estimate 134 + 397 by rounding each number to the nearest ten, then work it out.
7.Estimate 869 + 806 by rounding each number to the nearest ten, then work it out.
8.Estimate 792 + 813 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 2 · free to copy for classroom use

Answer key — Round then Estimate

Set 2. Prints on its own sheet.

  1. 1.about 1270; exactly 1271
  2. 2.about 690; exactly 682
  3. 3.about 830; exactly 831
  4. 4.about 1130; exactly 1132
  5. 5.about 1530; exactly 1526
  6. 6.about 530; exactly 531
  7. 7.about 1680; exactly 1675
  8. 8.about 1600; exactly 1605

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