Answer:
1. If any fraction is in mixed form, convert to a vulgar fraction. For example, convert 23/4 to 11/4.
2a. Multiply together all the numerators (tops) to give the numerator of the result.
2b. Multiply together all the denominators (bottoms) to give the denominator of the result.
3. Check the result for any common factors and remove them (by dividing both, numerator and denominator, by any such common factor).