Grade 1 - Number and Operations in Base Ten
Standard 1.NBT.2b - Count the objects from 1 to 100. Split the number into tens and ones to complete the equation.
Included Skills: Counting
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.