Only the number one.
12 would go into 24 evenly because 12×2=24.
One.
5
1, 2, 5, 10.
12=1*2*2*3 1 and 2 and 3 and 4 and 6 and 12 go into 12 evenly
1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180.
The numbers 1,2,3,5,6,10,15,and 30 go into 30 evenly.
The numbers that go into 30 are1, 2, 3, 5, 30, 15, 10, 6
5
1 2 3 4 6 12.
1 and 2 will go into both numbers evenly
12 cannot go into 10 evenly. It does go in unevenly though - 10 divided by 12 is 0.8333333333333.... with the 3 repeating infinitely.