5 and 9 come to mind (there are more of course)
The factors of 38 are: 1, 2, 19, 38 The factors of 45 are: 1, 3, 5, 9, 15, 45
The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, and 36.The prime factors of 36 are: 2 and 3.The factors of 45 are: 1, 3, 5, 9, 15, and 45.The prime factors of 45 are: 3 and 5.
The factors of 16 are: 1, 2, 4, 8, 16 The factors of 45 are: 1, 3, 5, 9, 15, 45
The common factors of 20 and 45 are 1 and 5 Factors of 45: 1 and 45, 3 and 15, and 5 and 9 Factors of 20: 1 and 20, 2 and 10, and 4 and 5 So the common factors are 1 and 5.
The factors of 32 are 1, 2, 4, 8, 16, and 32. The factors of 45 are 1, 3, 5, 9, 15, and 45.
The factors of 45 are 1, 3, 5, 9, 15, and 45. The factors of 98 are 1, 2, 7, 14, 49, and 98.
The factors of 45 are: 1, 3, 5, 9, 15, 45 The factors of 76 are: 1, 2, 4, 19, 38, 76
The factors of 32 are: 1, 2, 4, 8, 16, 32The factors of 45 are: 1, 3, 5, 9, 15, 45
The factors of 18 are: 1, 2, 3, 6, 9, 18The factors of 45 are: 1, 3, 5, 9, 15, 45
The factors of 18 are: 1, 2, 3, 6, 9, and 18.The prime factors of 18 are: 2 and 3.The factors of 39 are: 1, 3, 13, and 39.The prime factors of 39 are: 3 and 13.The factors of 45 are: 1, 3, 5, 9, 15, and 45.The prime factors of 45 are: 3 and 5.
Factors of 45 are 1, 3, 5, 9, 15, and 45 Factors of 20 are 1, 2, 4, 5, 10, and 20 The GCF of 45 and 20 is 5
The factors of 45 are: 1, 3, 5, 9, 15, 45. The factors of 76 are: 1, 2, 4, 19, 38, 76.