Colorado Common Core Standards
CO.2.1. Number Sense, Properties, and Operations
2.1.2. Formulate, represent, and use strategies to add and subtract within 100 with flexibility, accuracy, and efficiency. Students can:
2.1.2.a. Represent and solve problems involving addition and subtraction. (CCSS: 2.OA)
2.1.2.a.ii. Apply addition and subtraction concepts to financial decision making (PFL).