Use a code or invisible ink. There are many different codes a simple one is to use numbers 1-26 that represent the letters of the alphabet. Lemon juice can be used as an invisible ink. Write using...
there is no cheat to be good at maths but the path to maths is by practising all the time antill you get good at it. this goes with anything you do.
I should know this because im a maths freak and i...