To simplify a fraction, you need to find a common factor between the numerator and the denomenator, and divid both parts by that until you cannot anymore.
exg 84/54
both 84 and 54 are divisible by 2 -> 84 divided by 2 = 42 54 divided by 2 = 27
now, both 42 and 27 are divisible by 3 -> 42 diveded by 3 = 14 27 divisible by 3 = 9
so we are currently at 14/9. they have no common factor, so we cannot divide them further.
to completely simplify this, we will turn 14/9 into <u>1 and 5/9</u> (this is because 9 fits into 14 once, and the remainder is 5).
By finding a common factor of the numerator and denominator. When you find it divide them and keep going until you can't divide them by the same factor any more