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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 4 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 628 − 313 by rounding each number to the nearest hundred, then work it out.
2.Estimate 957 − 275 by rounding each number to the nearest hundred, then work it out.
3.Estimate 713 − 187 by rounding each number to the nearest hundred, then work it out.
4.Estimate 532 − 359 by rounding each number to the nearest hundred, then work it out.
5.Estimate 819 − 308 by rounding each number to the nearest hundred, then work it out.
6.Estimate 857 − 182 by rounding each number to the nearest hundred, then work it out.
7.Estimate 751 − 311 by rounding each number to the nearest hundred, then work it out.
8.Estimate 619 − 365 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 4 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 4. Prints on its own sheet.

  1. 1.about 300; exactly 315
  2. 2.about 700; exactly 682
  3. 3.about 500; exactly 526
  4. 4.about 100; exactly 173
  5. 5.about 500; exactly 511
  6. 6.about 700; exactly 675
  7. 7.about 500; exactly 440
  8. 8.about 200; exactly 254

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