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Mathematics - Elementary Curriculum
Mathematics Grade 1
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Lesson Plans  
Represent and solve problems involving addition and subtraction within 20 (Standards 12, 56). Understand and apply properties of operations and the relationship between addition and subtraction (Standards 34). Work with addition and subtraction equations (Standards 78).
Standard 1.OA.2
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.
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