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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 10 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 803 − 396 by rounding each number to the nearest hundred, then work it out.
2.Estimate 723 − 214 by rounding each number to the nearest hundred, then work it out.
3.Estimate 610 − 306 by rounding each number to the nearest hundred, then work it out.
4.Estimate 969 − 345 by rounding each number to the nearest hundred, then work it out.
5.Estimate 558 − 271 by rounding each number to the nearest hundred, then work it out.
6.Estimate 585 − 274 by rounding each number to the nearest hundred, then work it out.
7.Estimate 598 − 194 by rounding each number to the nearest hundred, then work it out.
8.Estimate 593 − 122 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 10 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 10. Prints on its own sheet.

  1. 1.about 400; exactly 407
  2. 2.about 500; exactly 509
  3. 3.about 300; exactly 304
  4. 4.about 700; exactly 624
  5. 5.about 300; exactly 287
  6. 6.about 300; exactly 311
  7. 7.about 400; exactly 404
  8. 8.about 500; exactly 471

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