88, 176, 264, 352, 440, 528 +88 . . .
The number that both 7 and 8 can go into evenly is 56.
As 8 is even, and 3 is odd, I think only 1 can go into both.
104
16
It is: 200
The LCM of 8 and 10 is 40
The number is 120.
7 and 8 both go into 56
Their HCF is 8
The LCM is 216
120
The only number that goes into both 8 and 45 is 1