Dalip- you need to put the fractions in order of size. Think about what a fraction is. If the fraction is 1/4 then the ‘whole’ is divided into 4 equal parts and we are ‘interested’ in one of them. If it was 1/8 then the same ‘whole’ would be divided into 8 equal parts. Which will be bigger? 1/4 or 1/8? Think of a pizza.
Year 4 can you think of a rule to decide which of a pair of fractions is bigger if it is a unit fraction (the numerator on the top of the fraction is a 1)?