It is true that 1 + 2 + 3 = 3 + 2 + 1, and the equation remains true if you remove two of the plus symbols: 1 + 23 = 3 + 21. Starting from the equation 1 + 2 + 3 + 4 ...
Students put all of their addition and subtraction skills together to solve equations. In this lesson, students put all of their addition and subtraction skills together to solve equations. Julia ...
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