Theory:

Like fractions are fractions with the same denominator.
Example:
18,28,38 
For fractions with the same denominator, the fraction with the greatest numerator will be the largest fraction.
Example:
Find the largest fraction among 18,28,38
 
All the fractions have the same denominator \(8\) so, they are like fractions.
 
Ordering the above numbers will result in 18<28<38
 
Among the numerators, \(3\) is the greatest and hence \(3/8\) is the largest fraction.