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A comment on A mathematician's way of converting miles to kilometers. Parent comment

Re:A mathematician's way of converting miles to kilometers by aquadrop on Sunday August 11, 2019 @04:49AM (#20667140)
I have similar way of calculating square meters from square feet. "Subtract 10% divide by 10". So for example 900 square feet: 900 - 90 = 810/10 = 81. Real answer is 83.6, close enough for me.
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