Kindergarten · Math · Domain guide

Number & Operations in Base Ten in Kindergarten (K.NBT)K.NBT Standards

Short answer. This is the smallest domain in kindergarten math, just one standard, and it punches way above its weight. K.NBT.A.1 asks your child to see the numbers 11 through 19 as ten ones plus some extra ones: 14 is 10 and 4 more, 18 is 10 and 8 more. Teen numbers are genuinely confusing in English (eleven and twelve give no clue about tens), so this takes real practice.

The single cluster, K.NBT.A, is labeled 'work with numbers 11-19 to gain foundations for place value,' and that's exactly what it is: the on-ramp to understanding that 47 means 4 tens and 7 ones in 1st grade. At home you'll see your child build a teen number with a full ten-frame plus leftovers, or write 16 = 10 + 6 after counting out 16 beans.

Grade: Kindergarten
Subject: Math
Standards: 1
Clusters: 1

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Every K.NBT standard, in order

Open a code for the official wording, a plain-English answer, what the skill can look like at home, and simple activities. The list below follows the Common Core sequence.

Cluster

Work with numbers 11-19 to gain foundations for place value.

1 standard

K.NBT.A.1Teen Numbers as Ten Plus More (K.NBT.A.1)
Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

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More than a standards list

Use the framework guide for context, the learning hub for explanations, or printable practice when your child is ready to work on a skill.

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