What happens to the denominator when you add fractions?
You must find a common denominator. You figure out the smallest
number that all of your denominators are divisible by. If you have
to multiply the denominators by 2, you must multiply the numerators
by 2, then add the numerators together, and write above the common
denominator. If you have to multiply one denominator to equal the
other denominator, then you must multiply the numerator above that
denominator, and finally add up the numerators and place above the
common denominator. Then reduce the answer to its smallest
fraction.