Calculating a percentage of a number

We think about percentages everyday in terms of discounted prices, or working out GST, or adding 20% to quantities to allow for overlap and wastage

These examples will show you 3 steps for calculating a percentage of a number.  You need this for trade calculations such as adding to a measurement to allow for overlap, calculating efficiency rates, working out GST.

For more explanation and practice on fractions, decimals and percentages go to:

www.bbc.co.uk/skillswise/numbers/fractiondecimalpercentage/

Percentages are a way of expressing parts of a whole.  The whole = 100%.  So if you get all the answers right in a workbook you'll get 100%.  If you get half the answers right you'll get 50%.

per cent means "out of 100"

So 50% means 50 out of 100 or 50
                                                          100

Step 1: Changing Percentages to Decimals

Step 2: Calculating a Percentage of a Number

Step 3: Calculating a Percentage and Adding it to the Whole

If you want to print these then click here