In a fraction n/d, n is the numerator and d is the denominator. The denominator of a fraction can never be 0, because division by 0 is not defined. Two fractions are said to be equivalent if they represent the same number. For example, 4/18 and 6/27 are equivalent since they both represent the number 2/9. In each case, the fraction is reduced
to lowest terms by dividing both the numerator and the denominator by their greatest common divisor. The greatest common divisor of 4 and 18 is 2 and greatest common divisor of 6 and 27 is 3
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