The factors of 165 are: 1, 3, 5, 11, 15, 33, 55, 165. The factors of 225 are: 1, 3, 5, 9, 15, 25, 45, 75, 225. The common factors are: 1, 3, 5, 15. The Greatest Common Factor (GCF) is: 15

The highest common factor of 45 (forty-five) and 8 (eight) would equal to 1 (one). See: 45= 1 x 45 8= 1 x 8 3 x 15 2 x 4 5 x 9 Common Factor= 1 H.C.F. (Highest Common Factor)= 1

The greatest common factor is the highest number that divides exactly into two or more numbers. 15: 1, 3, 5, 15 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 The GCF for 15 and 90 is 15.

The factors of 9 are 1, 3, and 9. The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 15 are 1, 3, 5, and 15. The common factors of 9, 12, and 15 are 1 and 3. Therefore, the least common factor (the smallest common factor) is 1.