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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 5 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 476 + 521 by rounding each number to the nearest ten, then work it out.
2.Estimate 194 + 111 by rounding each number to the nearest ten, then work it out.
3.Estimate 724 + 369 by rounding each number to the nearest ten, then work it out.
4.Estimate 845 + 295 by rounding each number to the nearest ten, then work it out.
5.Estimate 767 + 122 by rounding each number to the nearest ten, then work it out.
6.Estimate 551 + 236 by rounding each number to the nearest ten, then work it out.
7.Estimate 822 + 240 by rounding each number to the nearest ten, then work it out.
8.Estimate 488 + 166 by rounding each number to the nearest ten, then work it out.

LessonPrint · 3.NBT.A.1 · Set 5 · free to copy for classroom use

Answer key — Round then Estimate

Set 5. Prints on its own sheet.

  1. 1.about 1000; exactly 997
  2. 2.about 300; exactly 305
  3. 3.about 1090; exactly 1093
  4. 4.about 1150; exactly 1140
  5. 5.about 890; exactly 889
  6. 6.about 790; exactly 787
  7. 7.about 1060; exactly 1062
  8. 8.about 660; exactly 654

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