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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 11 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 747 − 326 by rounding each number to the nearest hundred, then work it out.
2.Estimate 558 − 368 by rounding each number to the nearest hundred, then work it out.
3.Estimate 666 − 158 by rounding each number to the nearest hundred, then work it out.
4.Estimate 493 − 383 by rounding each number to the nearest hundred, then work it out.
5.Estimate 990 − 157 by rounding each number to the nearest hundred, then work it out.
6.Estimate 459 − 349 by rounding each number to the nearest hundred, then work it out.
7.Estimate 900 − 195 by rounding each number to the nearest hundred, then work it out.
8.Estimate 850 − 284 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 11 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 11. Prints on its own sheet.

  1. 1.about 400; exactly 421
  2. 2.about 200; exactly 190
  3. 3.about 500; exactly 508
  4. 4.about 100; exactly 110
  5. 5.about 800; exactly 833
  6. 6.about 200; exactly 110
  7. 7.about 700; exactly 705
  8. 8.about 600; exactly 566

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