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.
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Each of these numbers will go evenly into 18: 1, 2, 3, 6, 9, 18.
The numbers that divide evenly into 18 are 1, 2, 3, 6, 9, 18, and the negative of each of those.
Numbers that can go into both 90 and 144 are 1, 2, 3, 6, 9, and 18.
1, 2, 3, 6.
1, 2, 3, 6, 9, 18 1, 7, 49