With the Common Core Standards, our students must be able to subtract with unknowns in different places. Here's a CHEEZY video of my niece and I playing this game with a missing subtrahend.
If you were so annoyed with my voice that you skipped over the video (hahaha):
For this game, you need googley eyes and this printable! That's all! :) Player 1 puts out as many eyes as they want. Player 2 counts them, writes that number in the first box, and then covers their eyes. Player 1 hides some of the eyes behind their back. Player 2 writes how many eyes are left in the last square and has to figure out how many were taken away. That number goes in the circle.