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Mathematics Grade 1
|Strand: OPERATIONS AND ALGEBRAIC THINKING (1.OA)
Represent and solve problems involving addition and subtraction within 20 (Standards 1–2, 5–6). Understand and apply properties of operations and the relationship between addition and subtraction (Standards 3–4). Work with addition and subtraction equations (Standards 7–8).
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20. For example, use objects, drawings, and equations with a symbol for the unknown number to represent the problem.