Quiz

I just assumed, though I haven't tried yet, that you could set any % you want. In that case just set 0% (maybe even -50%?) if it's a wrong answer.
{2:NUMERICAL:=23.8:0.1#Feedback for correct answer 23.8~%50%23.8:2#Feedback for half credit answer in the nearby region of the correct answer ~%0%11.9:2#No points for that! Hey, did you maybe use the radius instead of the diameter?}