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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.

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All 25 sets ask different questions.

Subtract Within 1000 — Estimate First

3.NBT.A.2

NameDate

Estimate first, then work it out.

1.Estimate 427 − 238 by rounding each number to the nearest hundred, then work it out.
2.Estimate 845 − 331 by rounding each number to the nearest hundred, then work it out.
3.Estimate 691 − 218 by rounding each number to the nearest hundred, then work it out.
4.Estimate 853 − 188 by rounding each number to the nearest hundred, then work it out.
5.Estimate 486 − 354 by rounding each number to the nearest hundred, then work it out.
6.Estimate 921 − 151 by rounding each number to the nearest hundred, then work it out.
7.Estimate 608 − 133 by rounding each number to the nearest hundred, then work it out.
8.Estimate 677 − 134 by rounding each number to the nearest hundred, then work it out.

LessonPrint · 3.NBT.A.2 · Set 1 · free to copy for classroom use

Answer key — Subtract Within 1000 — Estimate First

Set 1. Prints on its own sheet.

  1. 1.about 200; exactly 189
  2. 2.about 500; exactly 514
  3. 3.about 500; exactly 473
  4. 4.about 700; exactly 665
  5. 5.about 100; exactly 132
  6. 6.about 700; exactly 770
  7. 7.about 500; exactly 475
  8. 8.about 600; exactly 543

Questions about Subtract Within 1000 — Estimate First

What does the Subtract Within 1000 — Estimate First worksheet cover?

It practises estimating a difference before working it out — 8 questions for Grade 3, all on Common Core 3.NBT.A.2: Add and subtract within 1000 confidently. The instruction to pupils is “Estimate first, then work it out”, and the answer key follows on the next sheet.

Which Common Core standard does Subtract Within 1000 — Estimate First practise?

CCSS.MATH.CONTENT.3.NBT.A.2 — 3.NBT.A.2, in the Number & Operations in Base Ten domain for Grade 3. The published standard reads: “Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Subtract Within 1000 — Estimate First is written for Grade 3, typically ages 8-9. It is one of the sheets on 3.NBT.A.2, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Subtract Within 1000 — Estimate First come with an answer key?

Yes. All 8 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Subtract Within 1000 — Estimate First can I print?

25 — one per pupil, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Subtract Within 1000 — Estimate First free to print and photocopy?

Yes. Subtract Within 1000 — Estimate First, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

More practice for 3.NBT.A.2

Add and subtract within 1000 confidently.

All Grade 3 worksheets

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