Prime factorization of 72:
72/2=36
36/2=18
18/2=9
9/3=3
72=2*2*2*3*3
12 factors: 1 2 3 4 6 8 9 12 18 24 36 72.
Twelve, four and six factors, respectively.
9 x 8 = 72 10 x 12 = 120
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, 100
60, 72, 84, 90 and 96 are tied for first with 12. 48 and 80 have 10.
A factor is any number that will divide 72 evenly. The brute-force way to find the factors of 72 is to try every number starting with 1. While this sounds awful, it's not really so bad because you only have to go up to 9:72 / 1 = 72 (72 and 1 are factors)72 / 2 = 36 (26 and 2 are factors)72 / 3 = 24 (24 and 3 are factors)72 / 4 = 18 (18 and 4 are factors)72 / 5 = 14 remainder 2 (5 is not a factor)72 / 6 = 12 (12 and 6 are factors)72 / 7 = 10 remainder 2 (7 is not a factor)72 / 8 = 9 (9 and 8 are factors)72 / 9 = 9 (8 and 9 are factors)
The factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Since 36 is a factor of 72, the factors of 36 are included in the factors of 72.
Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. All of the factors of 36 are also factors of 72.
Apart from 1, all of the other factors of 72 are multiples of prime factors.
Since 36 is a factor of 72, all of its factors are included in the factors of 72.