Composes and decomposes numbers from 11 to 19 into 10 ones and some further ones (e.g., by using objects or drawings) and records each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understands that these numbers are composed of 10 ones and one, two, three, four, five, six, seven, eight, or nine ones.

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### Related standards

- This standard is part of: NBT.1
- This standard is derived from: CCSS.Math.Content.K.NBT.A.1

#### Similar standards in other grades

Composes and decomposes numbers from 11 to 19 into 10 ones and some further ones (e.g., by using objects or drawings) and records each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understands that these numbers are composed of 10 ones and one, two, three, four, five, six, seven, eight, or nine ones.

Use place value understanding to round whole numbers to the nearest 10 or 100.

100 can be thought of as a bundle of ten tens - called a “hundred.”

The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

10 can be thought of as a bundle of ten ones - called a “ten.”

#### Similar standards elsewhere

Record each composition or decomposition using a drawing or equation (e.g., 18 is one ten and eight ones, 18 = 1 ten + 8 ones, 18 = 10 + 8).

Compose and decompose numbers from 11 to 19 using quantities (numbers with units) of ten ones and some further ones. Understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

Compose and decompose numbers from 11–19 separating ten ones from the remaining ones using objects and drawings.

Compose and decompose numbers from 11 to 19 into ten ones and some more ones by using objects or drawings. Record the composition or decomposition using a drawing or by writing an equation.

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.