North Dakota Academic Content Standards
ND.1.OA. Operations and Algebraic Thinking
Represent and solve problems involving addition and subtraction.
1.OA.1. Use strategies to add and subtract within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.
Understand and apply properties of operations and the relationship between addition and subtraction.
1.OA.4. Demonstrate understanding of subtraction as an unknown-addend problem.
Add and subtract within 20.
1.OA.5. Relate counting to addition and subtraction.
1.OA.6. Use strategies to add and subtract within 20. Fluently add and subtract within 10.