The factors of 30 are:
1, 2, 3, 5, 6, 10, 15, 30
The factors of 36 are:
1, 2, 3, 4, 6, 9, 12, 18, 36
Common factors of 28 and 30 are: 1 and 2.
1, 2, 3 and 6
All of them except 23 and 29 which are prime numbers having only two factors
120
1, 2, 4, 5, 10, 20 1, 2, 3, 5, 6, 10, 15, 30
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.
Since 12 is a factor of 36, the factors of 12 are contained in the factors of 36.
Since 36 is a factor of 72, the factors of 36 are included in the factors of 72.
The LCM is: 90
the gcf is 3
21,22,23,24,25,26,27,28,29
The GCF is 6.