Two more marks are available if you know the definitions of mathematical equations, expressions and formulae. An equation in maths is when one part equals another, 2 + 2 = 4 is an equation. Look out for the equals sign. It isn't difficult you just need to know what equation means. An expression is something in maths that stands for a single number. So 2x + 7 is an expression. A formula (plural formulae) is usually an equation that contains useful information on how to solve a problem. It might be how to add the lengths and widths of rectangles to find the perimeter e.g. p = 2l + 2w.

You have come across quite a few formulae in these blogs, and if you have forgotten then there is the inside front cover of the exam paper to remind you - and this is the higher level paper. It talks about the areas of a triangle and a trapezium, the volumes of a sphere and a prism, and also mentions things like the sine rule. Use exam papers to your advantage.

With this third blog in the 'I can get full marks in a maths GCSE' series, you have just completed the first page of 18. The questions do get gradually harder but nothing is difficult when you know the answer. Keep following this blog.

That sums it up.

## Thursday, 9 April 2009

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