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Pythagoras theorum is used to identify the lengths of any side on a right angle triangle. The theorem is as follows:

a²  + b² = c²    

We assume that the hyp...

Begin by looking at the percentage reduction: 

100% - 35% = 65%

Therefore, 65% = £16 (as this was the price it was reduced to)

1% = £16 ÷ 65 = 0.2462

So to find the ...

When given two simultaneous equations, the first step is to make the factor of one letter equal in both equations. For example, in the example below, we will try to make both equations contain '2b':
...

To factorise an equation you need to look for factors that all the elements of the equation (3x^2 and 15x) have in common. You can do this all at one or in steps, to start with you can see that both parts...

This is a simple GCSE question which might feature at the beginning of the paper. It tests the student's attention to detail by asking to find the DIFFERENCE and not just the price that Sue paid. Also, gi...