Answer :
You simplify it by dividing 18/48 by 2 and keep simplifying till you get your final results.
18/48 = 3/8
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
