# Fractions (Part 3)

**Calculating a fraction of an amount**

It is a fairly common life skill to need to work out a fraction of an amount. If we are dealing with a unit fraction (where the numerator is one) it is easy. For example, to work out 1/**2** of an amount, divide by **2**; to work out 1/**5** of an amount, divide by **5**; to work out 1/**27** of an amount, divide by **27**. This video shows how to calculate a non-unit fraction of an amount, using the bar model method.

**Finding the Whole**

Finally, we can also use the bar model approach to work out the whole if we start by knowing a fraction of the amount.