# Math Problem Solving For Grade 1

Examples: If 8 3 = 11 is known, then 3 8 = 11 is also known. A.2Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. 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); and creating equivalent but easier or known sums (e.g., adding 6 7 by creating the known equivalent 6 6 1 = 12 1 = 13). Hands-On Problem Solving for Grade 1 is divided into three sections: routine, non-routine, and extended explorations.

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A.1Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.