A counter that adds and subtracts

Oct 24, 2016

I've created a drag and drop activity that has three outlined drop areas. The user needs to sort 38 cards into one of three piles. They are only allowed to put a certain number of cards in each pile. 

Right now the activity is open.

I would like to create a counter that will add +1 to the counter everytime the user drops a card on a box, so the learner has a visual on how many cards are in each pile without having to move them and count. I would also like the counter to subtract 1 when the user moves a card from the pile. 

I'm able to get the counter to add ... but I can't figure out how to get it to subtract. Any ideas?

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