Number and Operations in Base Ten 1.NBT 

• 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)