Groups are mathematical games being played with letters. In the simplest version, we use just one letter (say a), and are allowed to add it to or to remove it from a word. This is the free group of one generator, or the infinite cyclic group.
Freebie MATH Ghost-It! Game An October and Halloween Mathematics Game. ~ Perfect for an October Math Center! ~ Game Instructions included ~ Printable Ghost-It Cards included ~Print on card stock, laminate, and it makes a terrific learning center.