What+you+should+know!

 letters can be used to represent numbers 5 x n is written as 5n
 * 4 + X = 10 means X = 10 - 4

>  Equals means equals!!  - Be careful how you use it : 4 x n = 16 = n = 4 (NO!!)
 * 'add 5 to a number' is written as ' n + 5'
 * 'A number times 3' is written as '3 x n' OR '3n'
 * 'a number times itself' is written as 'n x n' OR 'n²'
 * 'n divided by m' is written as 'n/m'