Cute halloween math center. I used orange paper cups ($1 for 12 at Walmart) and just drew the faces and numbers on with a Sharpie!! Also, since I teach Pre-K, I used sticks with different numbers of dots instead of addition facts. You could use small plastic flower pots for other times of the year.
Game: true/false math facts I would use this when teaching about adding multiple numbers. I would have students do this in math centers. I really like how students have to work out all of the problems and then decide if they are true or false.