1, 2, 3, 6, 9, 18.
The only two numbers that go into 18 and 50 evenly are one and two.
The prime numbers (factors) of 18 are: 2 and 3
Each of these numbers will go evenly into 18: 1, 2, 3, 6, 9, 18.
Four: 1, 2, 3, 6.
1 2 3 6 9 18 27 54
Numbers that go into 18 are 1, 2, 3, 6, 9, and 18. You can figure this out by dividing 18 by all possible numbers, and seeing which ones come our as an integer, or whole number.
1, 2, 3, 6, 9, 18.
1, 2, 3, 6, 9, 18.
Three and one will go into both numbers.
There are too many, because numbers go on and on, narrow your search.
The numbers that divide evenly into 18 are 1, 2, 3, 6, 9, 18, and the negative of each of those.
9 + 9 = 18