Different Problems, Same Work (Linear Sytems)

Different Problems, Same Work (Linear Sytems)
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Because students often think the math in word problems is different just because the situation is different, I wrote these 4 problems (coins, mixture, sales, and interest) using almost the same numbers, set the problems up in chart form and wrote the system of equations. I asked them to find what the problems had in common (besides the numbers), getting them to focus on the mathematical ideas behind the equations. You can have them solve the systems and interpret the solutions in words of the problems (also a difficulty for some).
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