Number and Operations in Base Ten 1.NBTÂ
Extend the counting sequence (1.NBT.1)
Understand place value (NBT.3)
Operations and Algebraic Thinking 1.OA
Add and subtract within 20 (1.OA.5)
Represent and solve problems involving addition and subtraction (1.OA.1)
Understand & apply properties of operations and the relationship between addition & subtraction (1.OA.3)