Percentage Formula: Percentages are a fundamental concept in maths, used frequently in daily life. It represents parts of a whole as fractions of 100. They're symbolised by the "%" symbol.

When using chemical formula it is possible to calculate the percentage composition of the chemical. This can be useful when extracting metals from ores or when making fertilisers for specific plants.

CALCULATING percentage isn't always the easiest thing to do, but is a useful aide for anyone, especially if they can do so off the top of their head. Express.co.uk has compiled a handy guide on how to ...