Arizona's College and Career Ready Standards
AZ.1.OA. Operations and Algebraic Thinking (OA)
1.OA.B. Understand and apply properties of operations and the relationship between addition and subtraction.
1.OA.B.4. Understand subtraction as an unknown-addend problem within 20 (e.g., subtract 10 - 8 by finding the number that makes 10 when added to 8).
1.OA.C. Add and subtract within 10.
1.OA.C.5. Relate counting to addition and subtraction (e.g., by using counting on 2 to add 2).
1.OA.C.6. Fluently add and subtract within 10.
AZ.1.NBT. Number and Operations in Base Ten (NBT)
1.NBT.C. Use place value understanding and properties of operations to add and subtract.
1.NBT.C.4. Demonstrate understanding of addition within 100, connecting objects or drawings to strategies based on place value (including multiples of 10), properties of operations, and/or the relationship between addition and subtraction. Relate the strategy to a written form.