A mixed number is a number expressed as the sum of a whole number and a fractions, such as 
It is usually easier to do calculations with improper fractions than mixed numbers, but mixed numbers give a better idea of the size of a number. So you should know how to convert back and forth.
Example:
Write the mixed number
as an improper fraction.
First, write the mixed number as a sum of a whole number and a proper fraction. Then write the two parts with common denominator, and add.

Example:
Write the improper fraction
as a mixed number.
Divide the denominator into the numerator, and rewrite the fraction as a sum of the whole part plus the remainder.
