DON'T CHEAT -- what's the answer? Make your seventh grade math teacher proudpic.twitter.com/1WzWCJXtac
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Other oddities are grouping: instead of parenthesis, math teachers used to use curly and square brackets, to help prioritize operations. I remember a teacher being surprised that "computers only uses parenthesis".
After some time my teachers began using ":" instead of "÷". After learning fractions, only used the horizontal bar notation for divisions. Same thing happened with multiplication: "×" became ".", then mostly only parenthesis and implicit multiplication.
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