1 and 16
2 and 8
4 and 4
2,4,8 (1 and 16 are divisors too, but the number and 1 are always divisors)
The numbers that go into both 20 and 16 are their common divisors. The divisors of 20 are 1, 2, 4, 5, 10, and 20, while the divisors of 16 are 1, 2, 4, 8, and 16. The common divisors are 1, 2, and 4. Therefore, the numbers that go into both 20 and 16 are 1, 2, and 4.
16 by 2,4 by 8.
The divisors of 32 are: 1, 2, 4, 8, 16, 32.
The divisors of 64 are: 1 2 4 8 16 32 64.
64 has seven divisors: 1, 2, 4, 8, 16, 32, 64.
The divisors of 16 are 2, 4 and 8. The divisors of 24 are 2, 3, 4, 8 and 12. Hence the GCD is 8.
The divisors of 16 are 2, 4 and 8. The divisors of 24 are 2, 3, 4, 8 and 12. Hence the GCD is 8.
32 has six divisors (factors): 1, 2, 4, 8, 16, 32.
64 has 7 divisors: 1 2 4 8 16 32 64.
To divide 32 students into groups with equal numbers of students, the group sizes must be divisors of 32. The divisors of 32 are 1, 2, 4, 8, 16, and 32. Therefore, the students can be grouped into 1 group of 32, 2 groups of 16, 4 groups of 8, 8 groups of 4, 16 groups of 2, or 32 groups of 1.
The divisors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.