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Mental math's shortcut—pupil dilation suggests people start solving before all numbers are in
People often solve simple arithmetic problems, such as basic addition, subtraction, multiplication or division, in their ...
This summer, battle lines were drawn over a simple math problem: 8 ÷ 2(2 + 2) = ? If you divide 8 by 2 first, you get 16, but if you multiply 2 by (2 + 2) first, you get 1. So, which answer is right?
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