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.
Included Skills: Counting
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.