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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 20 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 659 − 396 by rounding each number to the nearest hundred, then work it out.
2.Estimate 548 − 358 by rounding each number to the nearest hundred, then work it out.
3.Estimate 511 − 238 by rounding each number to the nearest hundred, then work it out.
4.Estimate 774 − 221 by rounding each number to the nearest hundred, then work it out.
5.Estimate 512 − 230 by rounding each number to the nearest hundred, then work it out.
6.Estimate 737 − 323 by rounding each number to the nearest hundred, then work it out.
7.Estimate 635 − 192 by rounding each number to the nearest hundred, then work it out.
8.Estimate 671 − 113 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 20 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 20. Prints on its own sheet.

  1. 1.about 300; exactly 263
  2. 2.about 100; exactly 190
  3. 3.about 300; exactly 273
  4. 4.about 600; exactly 553
  5. 5.about 300; exactly 282
  6. 6.about 400; exactly 414
  7. 7.about 400; exactly 443
  8. 8.about 600; exactly 558

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