Whole group activity to practice subtraction of teen numbers minus single digit numbers. Give each student a card Students walk among their classmates looking for their “match.” There should be one of each color for a complete set. Once students have a complete set, they freeze.
If there are extra cards, place them in a central location (home base). Make sure the cards don’t make a complete set. Students must check the home base to see if one of their cards is there.