Arkansas Curriculum Frameworks
AR.Math.Content.2.OA. Operations and Algebraic Thinking
AR.Math.Content.2.OA.B. Add and subtract within 20.
AR.Math.Content.2.OA.B.2. Fluently add and subtract within 20 using mental strategies. By the end of Grade 2, know from memory all sums of two one-digit numbers.
AR.Math.Content.2.NBT. Number and Operations in Base Ten
AR.Math.Content.2.NBT.B. Use place value understanding and properties of operations to add and subtract.
AR.Math.Content.2.NBT.B.5. Add and subtract within 100 with computational fluency using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
AR.Math.Content.2.NBT.B.6. Add up to four two-digit numbers using strategies based on place value and properties of operations.
AR.Math.Content.2.NBT.B.7. Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written expression or equation.
AR.Math.Content.2.NBT.B.9. Explain why addition and subtraction strategies work, using place value and the properties of operations.