First, we agree on difference of 2.
Kate: (hides a certain number of fingers)
Me: It’s less than how many fingers?
Me: you’ve got 4 fingers!
Me: ( I hide my fingers )
Kate: It’s more than how many fingers?
Kate: You’ve got 9 fingers!
As they get better, increase the difference.
We can play this for 30 mintues. Good way to kill time on BART.