Arkansas Curriculum Frameworks
AR.Math.Content.1.OA. Operations and Algebraic Thinking
AR.Math.Content.1.OA.B. Understand and apply properties of operations and the relationship between addition and subtraction
AR.Math.Content.1.OA.B.4. Understand subtraction as an unknown-addend problem. For example: Subtract 10 - 8 by finding the number that makes 10 when added to 8.
AR.Math.Content.1.OA.C. Add and subtract within 20.
AR.Math.Content.1.OA.C.5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
AR.Math.Content.1.OA.C.6. Add and subtract within 20, demonstrating computational fluency for addition and subtraction within 10. Use strategies such as Counting on; Making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); Decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); Using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); Creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13)
AR.Math.Content.1.NBT. Number and Operations in Base Ten
AR.Math.Content.1.NBT.C. Use place value understanding and properties of operations to add and subtract
AR.Math.Content.1.NBT.C.4. Add within 100 using concrete models or drawings, relate the strategy used to a written expression or equation, and be able to explain the reasoning. Strategies should be based on place-value, properties of operations, and/or the relationship between addition and subtraction.