To solve these type of problem you have to make the denominator the same or use the claculator.
let us do this problem by making the denominator the same.


So, now. the one with the largest numerator is the largest fraction
In this case,

is the largest which is equal to

.
So, the largest fraction is

.
To make a improper fraction (eg11/4) a mixed number (eg 2 3/4) you must see how many times the numerator (number on the top) fits into the denominator (number on the bottom). This will give you the Whole number (big number) whatever is left will be the new numerator on the fraction (keeping the denominator the same).
To make a mixed number a improper fraction multiply the whole number by the denominator. Then add this number to the numerator.
Answer: biggest no.=27. Smallest number=9
Step-by-step explanation:
Let's take the smallest number as x and the biggest number as 3x since it is 3 times bigger than x.
The sum of these two numbers is 36
3x+x=36
4x=36
X( smallest number)=36/4: 9
While, the biggest number is 3x: 3×9=27