IN.2.1. Number Sense
Students understand the relationships among numbers, quantities, and place value in whole numbers up to 100. They understand that fractions may refer to parts of a set and parts of a whole.
2.1.1 Count by ones, twos, fives, and tens to 100.
Students solve simple problems involving addition and subtraction of numbers up to 100.
2.2.2 Add two whole numbers less than 100 with and without regrouping.
2.2.6 Use mental arithmetic to add or subtract 0, 1, 2, 3, 4, 5, or 10 with numbers less than 100.