2
Thirty 42 - 18 = 24 24 / 2 = 12 18 + 12 = 30 42 - 12 = 30
The common factors of 30 and 42 are 1, 2, 3, and 6.
30 is halfway between 18 and 42. Simply add 18 and 42 together (60) then divide by 2, which gives 30 as the answer.
Thirty 42 - 18 = 24 24 / 2 = 12 18 + 12 = 30 42 - 12 = 30
18 9,2 3,3,2 30 15,2 5,3,2 42 21,2 7,3,2
42
42
42
The greatest common factor of 18, 30, and 42 is 2.
6
6
It is: 630