U5: Percentages

Key Learning Points:

• You can treat them as fractions that are out of a whole of 100 (that is, 58% means 58 out of 100 parts).
• This also mean that the denominator of the fraction is 100.
• If you see questions involving percentages, you can change them into fractions by removing the '%' sign, then add a denominator '100' (that is, 88% = '88/100').
• Thus if a question say 20% of 40 pupils, it will mean '20/100' of 40 pupils, or when simplified, it means '1/5' of 40 pupils.
• Alternatively, you can convert a fraction or a decimal to a percentage by multiplying it by 100%, with the '%' symbol in your working. Else the working will be marked wrong.