Draw a giant grid (connect 4 board) on your whiteboard. Cut out the cards and number them 1-25 on the back. Lay the cards number side up on a table. Have students in small groups number their one group paper 1-25. Each group has a runner who picks a card and brings it back to their group to answer on the matching number line. Runner then runs paper to the teach who checks it. If correct they runner gets to chose a square on the connect 4 board to color for his/her team. The team that makes connect 4 first wins.