CO.K.1. Number Sense, Properties, and Operations
K.1.2. Composing and decomposing quantity forms the foundation for addition and subtraction. Students can:
K.1.2.a. Model and describe addition as putting together and adding to, and subtraction as taking apart and taking from, using objects or drawings. (CCSS: K.OA)
K.1.2.a.v. Use objects including coins and drawings to model addition and subtraction problems to 10 (PFL).