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Since you didn't specifically address the kind of math you were teaching, it is hard to be specific, but one idea that comes to mind has to do with "people" graphs. You can practice adding and subtracting positive and negative numbers by making a human number line and having students perform the operations. You can line everyone up on a number line and do graphs of functions; for example, give directions like "add two to your y-coordinate and move that many spaces. What have you formed? Why? Double your x-coordinate." "Take the absolute value of your x-value." "Square your x." Etc. You can do this with upper-level math functions too, by calling out the formula and having the students figure out where they are supposed to be. This works well if you have bleachers. You can do trig functions, too. Have fun!
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