1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Factors of 90 will be factors of 180.
90 has more than six factors.
9: 1,3.9 90: 1,2,3,5,6,9,10,15,18,30,45,90 81: 1,3,9,27,81
The common factors of 45 and 90 are 1,3,5
19 and 90 have no common prime factors.
The odd factors of 90 are 1,3,5,9 and 15.
Twelve factors.
Since 45 is a factor of 90, all of its factors are common.
The odd composite factors of 90 are: 9, 15, 45
90 has three prime factors: 2, 3 and 5.
Factors of 90: 2*3^2*5 Factors of 100: 2^2*5^2
The prime factors of 90 are 2,3,3,5.