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Grade 1 - Number and Operations in Base Ten
Standard K.NBT.A.1 - Count the objects from 1 to 100. Split the number into tens and ones to complete the 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 (such as 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.