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11 Simple Math Hacks

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why did you post this?
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Quick square calculation is wrong. Well image is correct but text is wrong
Multiplying the first digit by itself and adding 1 will is 3x3+1 = (3x3)+1 = 9+1 = 10
Multiplying the first digit by adding 1 to it is 3x(3+1) = 3x4 =12
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