Only the number one.
12 would go into 24 evenly because 12×2=24.
One.
5
1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180.
12=1*2*2*3 1 and 2 and 3 and 4 and 6 and 12 go into 12 evenly
1, 2, 5, 10.
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
The number that can go into both 10 and 12 is their greatest common divisor (GCD), which is 2. Both 10 and 12 are divisible by 2, as well as by 1. Other divisors include 5 for 10 and 3 for 12, but they do not divide both numbers evenly.
1 2 3 4 6 12.
1 and 2 will go into both numbers evenly