Only 1.
1 and 3 will go into both numbers evenly
1, 3, 13, 39.
1, 2, 3, 6, 13, 26, 39, 78.
It does not go evenly.
Factors of 39: 1, 3, 13, 39 Factors of 26: 1, 2, 13, 26 Common factors: 1, 13.
1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156.
Because there are only four numbers that divide into those numbers evenly.
no numbers!
1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
Yes 39 times