K.NBT.A.1 — Compose and decompose numbers from 11 to 19 into ten ones and some further ones.
Cluster: Work with numbers 11–19 to gain foundations for place value
What this standard asks students to do
K.NBT.A.1 is a Kindergarten Common Core standard in the Number & Operations in Base Ten strand. It asks students to: compose and decompose numbers from 11 to 19 into ten ones and some further ones. Teachers typically address it during the work with numbers 11–19 to gain foundations for place value cluster, alongside the related standards listed below. FoxFish generates printable worksheets, auto-graded quizzes, and flashcard sets aligned to this standard in seconds.
Sample questions aligned to K.NBT.A.1
- Example 1
13 = 10 + ___
- Example 2
How many tens and ones are in 17?
- Example 3
Show 15 with one ten-rod and ones.
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Common student mistakes
Build distractors and reteach prompts around the errors students actually make on this standard.
- 1Reading 14 as 'one-four' or 'forty' — teen numbers are phonologically irregular in English.
- 2Writing 14 as 41 when transcribing spoken numbers.
- 3Decomposing 14 into 1 and 4 (instead of 10 and 4).
Teacher FAQ
Why are teen numbers so hard for kindergartners?
English teen number names are irregular (compare to Mandarin's 'ten-one, ten-two, ten-three…'). Students must learn the names by memory, then connect them to the 10-and-some-ones structure CCSS requires. Use ten-frames daily.
Teacher guides for K.NBT.A.1
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