Assign a group “leader” (I recommend an adult leader). You help bring each group leader come in when it’s their turn to sing. Before you break off into groups, sing the song together as a whole. Then add one group at a time, challenging the kids to see if they can go up to 4 groups! See if they are up to the challenge!
This also doubles as a great Wiggle song! Check out my Wiggle Worm Jar HERE.