South Carolina Standards & Learning
SC.2.NSBT. Number Sense and Base Ten
2.NSBT.5. Add and subtract fluently through 99 using knowledge of place value and properties of operations.
2.NSBT.6. Add up to four two-digit numbers using strategies based on knowledge of place value and properties of operations.
2.NSBT.7. Add and subtract through 999 using concrete models, drawings, and symbols which convey strategies connected to place value understanding.
SC.2.ATO. Algebraic Thinking and Operations
2.ATO.2. Demonstrate fluency with addition and related subtraction facts through 20.