Why do I keep getting the wrong answer when tackling percentage change questions?

Percentage change isn't always as simple as you think. Whilst taking into consideration if it is a percentage increase or decrease, you also need to consider whether you're calculating a result before or after the percentage change has taken place. 

For example, are you working out the value of a £13500 car after a 15% depreciation, or are you working out the original value of a £800 sofa before it was in a 30% off sale? There are some tips that can be learnt to ensure you never get a percentage change question wrong ever again.

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Answered by Emma S. Maths tutor

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how am I meant to solve sq.root(6^2+8^2) = cube.root(125a^3) when one side is squared and the other is cubed?


Solve 4(x+3)=2x+8


Factorise and solve: x^2 - 8x = -15


Solve simultaneously, x+y=2 and 4y^2-x^2=11


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