when comparing fractions the denominators of the 2 fractions should be equal 
the fractions being compared 
 the denominator is 4
 the denominator is 4
therefore both fractions have the same denominator 
then we can directly compare the numerators 
higher the numerator value, higher the value of the fraction 
so from 1/4 and 2/4 , the fraction with a greater numerator is 2/4 
so the larger fraction is 2/4