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It actually depends if it's even or odd. So with odd numbers you take away one then divide by two then times it by the number you started with and you have your answer. I'll show you.

e.g 13-1=12/2=6 13x6=78

With even numbers its almost the same thing but all you do is divide by two again and times by the number you started with and your answer is there.

22/2=11 22x11=242

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15y ago

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