14
1, 2, 7, 14.
2 and 7
7
There is no number that goes into both. must be a trick questionthis is another person not the same one :)the number that goes into 12 and 21 is 3 which is a 5th grade problemwho ever said theres no number that goes into 12 and 21 is WRONG!
30
What blank?
14
1, 2, 7, 14.
1, 2, 7, 14.
1, 2, 7, 14
2 and 7
7
2
1
-15
Two.