These numbers go evenly into 20: 1, 2, 4, 5, 10, 20.
Only the number one.
Just the number one.
These numbers go evenly into both 800 and 160 evenly: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160.
1 and 2
1 and 5.
Because 4 is the largest number that divides evenly into both 16 and 20.
What goes into 22 and 100 evenly
2 does
2
The GCF of 15 and 20 is 5
Just 1.