See if this kind of math sentence would be really interesting for them to see:
In the same operation as, if say '5-3=2', as have five chairs, take away three chairs, then have two chairs left.
Then if square root of negative one is one I. (Imaginary one) Written as 1i as short.
Then is change 1 to 1i is the same operation as change a real chair to just a chair that you see only in a dream?