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Build the Number is a free printable Grade 2 maths worksheet on composing from hundreds, tens and ones, aligned to Common Core standard 2.NBT.A.1. It prints 12 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 1 of 25 · the same problems every time you open this link.

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One paper per pupil

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All 25 sets ask different questions.

Build the Number

2.NBT.A.1

NameDate

Fill in the missing part.

1.4 hundreds, 1 tens and 3 ones = ___
2.6 hundreds, 2 tens and 4 ones = ___
3.8 hundreds, 1 tens and 7 ones = ___
4.8 hundreds, 8 tens and 9 ones = ___
5.5 hundreds, 1 tens and 1 ones = ___
6.3 hundreds, 7 tens and 4 ones = ___
7.1 hundreds, 8 tens and 6 ones = ___
8.7 hundreds, 6 tens and 2 ones = ___
9.4 hundreds, 8 tens and 9 ones = ___
10.8 hundreds, 0 tens and 5 ones = ___
11.8 hundreds, 9 tens and 1 ones = ___
12.8 hundreds, 2 tens and 5 ones = ___

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

Answer key — Build the Number

Set 1. Prints on its own sheet.

  1. 1.413
  2. 2.624
  3. 3.817
  4. 4.889
  5. 5.511
  6. 6.374
  7. 7.186
  8. 8.762
  9. 9.489
  10. 10.805
  11. 11.891
  12. 12.825

Questions about Build the Number

What does the Build the Number worksheet cover?

It practises composing from hundreds, tens and ones — 12 questions for Grade 2, all on Common Core 2.NBT.A.1: Know what each digit means in a three-digit number. The instruction to pupils is “Fill in the missing part”, and the answer key follows on the next sheet.

Which Common Core standard does Build the Number practise?

CCSS.MATH.CONTENT.2.NBT.A.1 — 2.NBT.A.1, in the Number & Operations in Base Ten domain for Grade 2. The published standard reads: “Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Build the Number is written for Grade 2, typically ages 7-8. It is one of the sheets on 2.NBT.A.1, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Build the Number come with an answer key?

Yes. All 12 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 Build the Number 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 Build the Number free to print and photocopy?

Yes. Build the Number, 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 2.NBT.A.1

Know what each digit means in a three-digit number.

All Grade 2 worksheets

Last reviewed 2026-09-05. Aligned to 2.NBT.A.1 of the Common Core State Standards for mathematics.