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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 8 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 406 − 209 by rounding each number to the nearest hundred, then work it out.
2.Estimate 704 − 113 by rounding each number to the nearest hundred, then work it out.
3.Estimate 710 − 293 by rounding each number to the nearest hundred, then work it out.
4.Estimate 507 − 172 by rounding each number to the nearest hundred, then work it out.
5.Estimate 571 − 112 by rounding each number to the nearest hundred, then work it out.
6.Estimate 432 − 283 by rounding each number to the nearest hundred, then work it out.
7.Estimate 669 − 187 by rounding each number to the nearest hundred, then work it out.
8.Estimate 793 − 233 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 8 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 8. Prints on its own sheet.

  1. 1.about 200; exactly 197
  2. 2.about 600; exactly 591
  3. 3.about 400; exactly 417
  4. 4.about 300; exactly 335
  5. 5.about 500; exactly 459
  6. 6.about 100; exactly 149
  7. 7.about 500; exactly 482
  8. 8.about 600; exactly 560

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