I've got myself to the stage where all the numbers are looking the same.
The symbols have to be arranged to form a statement where 3 is the answer. Each symbol can only be used once.
( 1 9 - + x 2 5 )
I have managed to arrange it for -3 but not 3 and I'm not creative enough with maths to find these sort of questions easy.
How? How do you know how to do it?!