These are the whole numbers that go into 9 evenly: 1, 3, 9.
One.
3
No, it does not. The only single-digit numbers that do are: 1, 2, 4, 5, 8.
1, 2, 3, 4, 6, 9, 12, 18, 36
9: 1 2 3 4 6 9 12 18 36.
The hcf is 9
3 and 9
1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180.
1 and 3 go into both.
These are the whole numbers that go into 27 evenly: 1, 3, 9, 27.
Each of these numbers will go evenly into 18: 1, 2, 3, 6, 9, 18.