North Carolina Standard Course of Study
NC.1.OA. Operations and Algebraic Thinking
Represent and solve problems.
NC.1.OA.1. Represent and solve addition and subtraction word problems, within 20, with unknowns, by using objects, drawings, and equations with a symbol for the unknown number to represent the problem, when solving:
NC.1.OA.1.a. Add to/Take from-Change Unknown
NC.1.OA.1.b. Put together/Take Apart-Addend Unknown
NC.1.OA.1.c. Compare-Difference Unknown
Understand and apply the properties of operations.
NC.1.OA.4. Solve an unknown-addend problem, within 20, by using addition strategies and/or changing it to a subtraction problem.
Add and subtract within 20.
NC.1.OA.9. Demonstrate fluency with addition and subtraction within 10.
NC.1.OA.6. Add and subtract, within 20, using strategies such as:
NC.1.OA.6.a. Counting on