~Hello There!~
Simply go up in the times tables for each number until you find a number that is in all 4.
3, 6, 9, 12, 15, 18, 21, 24
4, 8, 12, 16, 20, 24
6, 12, 18, 24
8, 16, 24
As you can see, 24 is in all 4 times tables. Therefore, 24 is the answer.
Hope This Helps You!
Good Luck :)
Have A Great Day ^_^
- Hannah ❤