The LCM is 216
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
120
The only number that goes into both 8 and 45 is 1
You can simply 27 over 72 by taking the greatest common factor- 9- and dividing them both by that number. 27/9=3, 72/9=8. So, you can simplify 27/72 to 3/8.