What is the GCF of 9 15 and 45?

Answer 1

9 prime factors --> 3,3

15 prime factors --> 5,3

45 prime factors --> 5,3,3

They all share 3 therefore: "3";

Between 9 and 45 they share: 3,3 ----for 9 & 45 gcf is 3*3 = 9;