I'm almost ashamed to post this, but a recent discussion about how most students and adults got a simple math problem wrong was circulated by the internet news. You may have seen it; the problem was:
what is the answer to 9-3÷1/3 +1. The correct answer was given as 1. It's been a long time since I was in school, but the expression 3÷1/3 gives me much confusion.
They arrived at the answer as follows: Following the principal of the "order of operations" 3÷1/3 is the same as 3 x 3/1 which = 9; so 9-9+1 = 1.
I look at it differently: 3÷1/3 is the same as 3÷0.333 or 9.009009. My answer becomes 9-9.009.009+1 or 1.009009. Where am I going wrong? I do machining and .009 makes a big difference as to whether a part fits or not.
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