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Teen Numbers — Build from Ten is a free printable Kindergarten maths worksheet on producing the teen number from its parts, aligned to Common Core standard K.NBT.A.1. It prints 5 questions with an answer key on its own sheet of paper, in 25 versions, 24 of them with 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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24 of these 25 sets ask different questions — this skill does not have 25 questions to give. The rest reorder them, so no two pupils have the same paper in front of them.

Teen Numbers — Build from Ten

K.NBT.A.1

NameDate

Fill in the missing part.

1.10 + 1 = ___
2.10 + 2 = ___
3.10 + 5 = ___
4.10 + 7 = ___
5.10 + 9 = ___

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

Answer key — Teen Numbers — Build from Ten

Set 1. Prints on its own sheet.

  1. 1.11
  2. 2.12
  3. 3.15
  4. 4.17
  5. 5.19

Questions about Teen Numbers — Build from Ten

What does the Teen Numbers — Build from Ten worksheet cover?

It practises producing the teen number from its parts — 5 questions for Kindergarten, all on Common Core K.NBT.A.1: See the teen numbers as a ten plus some extra ones. The instruction to pupils is “Fill in the missing part”, and the answer key follows on the next sheet.

Which Common Core standard does Teen Numbers — Build from Ten practise?

CCSS.MATH.CONTENT.K.NBT.A.1 — K.NBT.A.1, in the Number & Operations in Base Ten domain for Kindergarten. The published standard reads: “Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Teen Numbers — Build from Ten is written for Kindergarten, typically ages 5-6. It is one of the sheets on K.NBT.A.1, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Teen Numbers — Build from Ten come with an answer key?

Yes. All 5 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 Teen Numbers — Build from Ten can I print?

25 versions, of which 24 ask genuinely different questions — this skill does not have 25 distinct questions to give, so the rest reorder them and no two pupils still share a paper. Set 1 downloads all 25 as one PDF.

Is Teen Numbers — Build from Ten free to print and photocopy?

Yes. Teen Numbers — Build from Ten, 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.

Is there a lesson plan to teach K.NBT.A.1?

Yes — “Teen Numbers as Ten and Ones” is a 30-minute Kindergarten plan for K.NBT.A.1, timed section by section, with the misconceptions to expect and an exit ticket. Teen Numbers — Build from Ten is the practice that follows it.

More practice for K.NBT.A.1

See the teen numbers as a ten plus some extra ones.

Teaching this next? Teen Numbers as Ten and Ones is the 30-minute plan for it, with the misconceptions to expect.

All Kindergarten worksheets

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