A formula is another way of writing maths rules.  This is very useful when working out word problems.   A simple formula will be like:  Area = length x width.     Instead of length, in maths we can use l, w instead of width and A instead of area.   So we can then write

A = l x w.

Things to know about formulae (formulae is plural of formula).

1. A letter next to a number means they are multiplied together, i.e 6z means 6 x z
2. You can use any letter in formulae, a, b, n, z, x
3. Try not to use x as it can easily be confused with times or multiplication

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