Operations and Algebraic Thinking

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Represent and solve addition and subtraction word problems, within 20, with unknowns, by using objects, drawings, and equations with a symbol for the unknown number to represent the problem, when solving: • Add to/Take from-Change Unknown • Put together/Take Apart-Addend Unknown • Compare-Difference Unknown.
Represent and solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, by using objects, drawings, and equations with a symbol for the unknown number.
Apply the commutative and associative properties as strategies for solving addition problems.
Solve an unknown-addend problem, within 20, by using addition strategies and/or changing it to a subtraction problem.
Demonstrate fluency with addition and subtraction within 10.
Add and subtract, within 20, using strategies such as: • Counting on • Making ten • Decomposing a number leading to a ten • Using the relationship between addition and subtraction • Using a number line • Creating equivalent but simpler or known sums.
Apply understanding of the equal sign to determine if equations involving addition and subtraction are true.
Determine the unknown whole number in an addition or subtraction equation involving three whole numbers.

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