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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 15 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 783 − 166 by rounding each number to the nearest hundred, then work it out.
2.Estimate 936 − 255 by rounding each number to the nearest hundred, then work it out.
3.Estimate 583 − 206 by rounding each number to the nearest hundred, then work it out.
4.Estimate 997 − 193 by rounding each number to the nearest hundred, then work it out.
5.Estimate 608 − 340 by rounding each number to the nearest hundred, then work it out.
6.Estimate 685 − 360 by rounding each number to the nearest hundred, then work it out.
7.Estimate 765 − 399 by rounding each number to the nearest hundred, then work it out.
8.Estimate 490 − 294 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 15 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 15. Prints on its own sheet.

  1. 1.about 600; exactly 617
  2. 2.about 600; exactly 681
  3. 3.about 400; exactly 377
  4. 4.about 800; exactly 804
  5. 5.about 300; exactly 268
  6. 6.about 300; exactly 325
  7. 7.about 400; exactly 366
  8. 8.about 200; exactly 196

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