There's supposed to be a 'numberwang' equation that would be a connection between the numbers- but, if you want to play at home, I recommend choosing a number to represent another number. You could use an equation or a theme (make all the represented numbers evil numbers or happy numbers) or just do it randomly (so 4 could be represented by 3.5- so when the contestant says 3.5 you would 'hear' 4.) Then you could decide which numbers are numberwang using a similar system.