360
35 x 4.5 ie 140 + 17.5 ie 157.5
In order to find GCF, you need to find all the prime factors that go into both numbers. 450: 2 * 3 * 3 * 5 * 5 735: 3 * 5 * 7 * 7 Now, look at the prime factors that they each have in common: one 3 and one 5. Multiply those and you have the GCF: 3 * 5 = 15