How about: 80
The number that both 7 and 8 can go into evenly is 56.
1, 2, 4, 8, 16.
1, 2, and 3 for both 16 and 30.
They both will divide into 6 evenly
144
How about: 80
The number that both 7 and 8 can go into evenly is 56.
The number is 112 and its multiples.
1, 2, 4, 8, 16.
144
288
These numbers go evenly into both 800 and 160 evenly: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160.
1, 2, and 3 for both 16 and 30.
3 and 1 will go into both number evenly leaving no remainders.
80, among others.
They both will divide into 6 evenly