For example consider 1 and 2/3. In this mixed fraction 1 is the whole number and 2/3 is the fraction. You simply have to multiply the denominator with the whole number and add the numerator to the resulting answer. Consider the fraction 1 and 2/3.All you have to do is multiply the whole number 1 with the denominator 3 which is step one and gives you 3 as a result and then add 2 the numerator to the result of step one that is add 2 with 3 and it will give you 5. Then just take the end answer as the numerator and add the original denominator as the denominator to make it an improper fraction. Just take the answer 5 as the numerator and 3 as the denominator in this case. The improper fraction is 5/3.