Answer :

You simplify it by dividing 18/48 by 2 and keep simplifying till you get your final results.

18/48 = 3/8 


You find out what number they both have in common. So, in this case

18/48

They are both divisible by 6 (6 is the greatest common factor between the two.)

Now ,divide 6 and 8 then 6 and 48 to get

3/8