K.NBT Number and Operations in Base Ten
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Work with numbers 11-19 to gain foundations for place value
K.NBT.1. Compose and decompose numbers from 11 to 19 into ten
ones and some further ones, eg, by using objects or drawings, and
record each composition or decomposition by a drawing or equation (eg,
18 = 10 + 8); understand that these numbers are composed of ten ones
and one, two, three, four, five, six, seven, eight or nine ones. Aligned
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