Hi there! Welcome to my store.
I found the idea for addition/subtraction tower cards online, and just couldn't find any that I was happy with. Either the font was off. or the border looked unattractive... or of course, the price was too much!
Here is how they work:
Children are in groups of three or four and they take turns reading the card and creating the tower. With each card they add more to their tower, and when the game ends the person with the highest tower wins.
Preparation: I would recommend printing and laminating them at least twice. Make sure you have whiteboard markers for the kiddies to use also!
My kiddies love this game, and learn so much from it. I hope yours do too!