These cards can be used individually, in small groups, or with the whole class. These make a great game for reviewing for a test!
For my class I make four copies of the card set. Then each group places all of one color in a stack (the lighter color). The darker green cards can then be distributed among the group. Students take turns seeing if they have a match to the card on top of the stack. If they have a match, then they keep the matching cards.