Including 1 and 18, 18 has 6 factors: 1, 2, 3, 6, 9, and 18.
The factors of 18 are: 1, 2, 3, 6, 9, and 18.The prime factors of 18 are: 2 and 3.The factors of 20 are: 1, 2, 4, 5, 10, and 20.The prime factors of 20 are: 2 and 5.
The only common factor of 5, 9, and 18 is 1. The factors of 5 are 1 and 5 The factors of 9 are 1, 3, and 9 The factors of 18 are 1, 2, 3, 6, 9 and 18 The common factor is 1.
18,9,6,3,2,1
The factors of 15 are: 1, 3, 5, 15 The factors of 18 are: 1, 2, 3, 6, 9, 18
Prime factors of 18 are 2 and 3 Prime factors of 15 are 3 and 5
The prime factors of 18 are 2, 3 and 3 The prime factors of 25 are 5 and 5 There are no factors (other than 1) common to both 18 and 25.
268
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.
The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 20 are: 1, 2, 4, 5, 10, 20 The factors of 50 are: 1, 2, 5, 10, 25, 50 The common factors are: 1, 2 The factors of 12 are: 1, 2, 3, 4, 6, 12 The factors of 15 are: 1, 3, 5, 15 The factors of 18 are: 1, 2, 3, 6, 9, 18 The common factors are: 1, 3
23
The factors of 18 are 1, 2, 3, 6, 9, and 18 The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30
Prime factors of 18 are 2 and 3 Prime factors of 45 are 3 and 5