NBT

Kindergarten » Number & Operations in Base Ten

http://www.corestandards.org/Math/Content/K/NBT

Work with numbers 11-19 to gain foundations for place value.
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 (such as 18 = 10 + 8);

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