The Greatest Common Factor (GCF) for 72 and 96, notation CGF(72,96), is 24. Explanation: The factors of 72 are 1,2,3,4,6,8,9,12,18,24,36,72; The factors of 96 are 1,2,3,4,6,8,12,16,24,32,48,96. So, as we can see, the Greatest Common Factor or Divisor is 24, because it is the greatest number that divides evenly into all of them.
You multiply it with the same number you use for the denominator. in this case 3/4 and 7/10 you find the LCM of the denominator is 20 so for 4 to become 20 you multiply by 5 then for the numerator 3 also multiply by 5, so you get 15/20 its the same also with 7/10, you multiply both the numerator and the denominator by 2 and get 14/20 hope it help... :)
