Just 1.
The common factors of 17 and 45 are determined by identifying the factors of each number. Since 17 is a prime number, its only factors are 1 and 17. The factors of 45 are 1, 3, 5, 9, 15, and 45. Therefore, the only common factor between 17 and 45 is 1.
The only factor these two numbers have in common is 1. Factors of 34: 1, 2, 17, 34 Factors of 45: 1, 3, 5, 9, 15, 45
The common factors of 35 and 45 are: 1 and 5
The common factors of 24 and 45 are: 1 and 31 and 3
The factors of 45 are 1, 3, 5, 9, 15, 45. For them to be common, they need to be compared to another set of factors.
The common factors of 45 and 54 are: 1, 3, and 9
The common factors of 18 and 45 are 1, 3 and 9.
Since 45 is a factor of 90, all of its factors are common.
The common factors of 45 and 108 are: 1, 3 & 9.
Since 45 is a factor of 900, all of its factors are common.
Common factors of 45 and 999 are: 1, 3, and 9.
The common factors of 45 and 63 are 1, 3, and 9.