Answer:
4
Explanation:
460 and 756
These both even so divide by 2
230 and 378
These are still even so divide by 2 again to get
115 and 189
Now find the factors of 115
115: 1,5,23,115
None of these numbers are factors of 189 so you can't factor any further
Sense we divide by 2 twice to get to 115 and 189 the highest common facot is 4