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To simplify a number, you have to find the greatest common factor (of the numerator and the denominator) and divide each number by the greatest common factor.
The greatest common factor of 3 and 12 is 3.
Now divide each 3 and 12 by 3.
3 ÷ 3 = 1
12 ÷ 3 = 4
Now the numerator is 1 and the denominator is 4.
3/12 in reduced form is 1/4.
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