When teaching addition and subtraction of positive and negatives, I make use of a little bird image and depending on the operation, and +/- value of each number in the equation, the bird will face different directions. It doesn't sound very helpful here, but when explained correctly in class, I find this process really assists students in applying this concept.
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Somehow it is another approach to teaching abstract topic like math having the concrete example. As they say there are many ways on how to kill a chicken. Thank you for sharing your strat..