how to change 1/2 into a whole number

in my math class my teacher said that 1/3 was equal to 3, my problem ask numbers to be multiplied by a fraction, 1/2 but i need to know how to change it to a whole number

10/23/12

why cant you divide by zero, wont it just be zero?

my teacher asked this but i dont know why you cant divide by zero

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