Here is an excellent discussion of rational numbers. -->
Rational number - Wikipedia, the free encyclopedia do you have a speciific question?
Fractions are multiplied by multiplying both numerators together and putting that over the two denominators multiplied together. Then you reduce the two parts to lowest terms by factoring out all common factors. (if both the numerator and denominator are even, divide by 2) Dividing fractions is similar except you invert the divisor before multiplying. For adding and subtracting, you need common denominators before you begin. A simple way to do this is to multiply the first fraction by the second fraction's denominator and multiply the second fraction by the first's denominator. After both denominators are the same, add the two numerators and place the sum over the common denominator. Then reduce to lowest terms.
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