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Subtract Within 1000 — Estimate First is a free printable Grade 3 maths worksheet on estimating a difference before working it out, aligned to Common Core standard 3.NBT.A.2. 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 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 17 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.

Subtract Within 1000 — Estimate First

3.NBT.A.2

NameDate

Estimate first, then work it out.

1.Estimate 778 − 229 by rounding each number to the nearest hundred, then work it out.
2.Estimate 751 − 364 by rounding each number to the nearest hundred, then work it out.
3.Estimate 482 − 349 by rounding each number to the nearest hundred, then work it out.
4.Estimate 598 − 313 by rounding each number to the nearest hundred, then work it out.
5.Estimate 434 − 361 by rounding each number to the nearest hundred, then work it out.
6.Estimate 478 − 372 by rounding each number to the nearest hundred, then work it out.
7.Estimate 712 − 316 by rounding each number to the nearest hundred, then work it out.
8.Estimate 840 − 213 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 17 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 17. Prints on its own sheet.

  1. 1.about 600; exactly 549
  2. 2.about 400; exactly 387
  3. 3.about 200; exactly 133
  4. 4.about 300; exactly 285
  5. 5.about 0; exactly 73
  6. 6.about 100; exactly 106
  7. 7.about 400; exactly 396
  8. 8.about 600; exactly 627

Last reviewed 2026-09-05. Aligned to 3.NBT.A.2 of the Common Core State Standards for Mathematics.