This can either be played up front, with everyone watching, or as a group with everyone playing.
Have everyone in your group (or the people on stage) pair up and face each other. Each person holds up zero to ten fingers behind their back. On the count of three, have them pull their hands from behind their backs. The first person to yell out the correct sum of all the fingers wins. Do best two of three. Then bring the winners up front to play each other until you have a champion.
Jonathan McKee is the author of over twenty books including the brand new The Bullying Breakthrough; The Teen’s Guide to Social Media & Mobile Devices; If I Had a Parenting Do Over; and the Amazon Best Seller - The Guy's Guide to God, Girls and the Phone in Your Pocket. He speaks to parents and leaders worldwide, all while providing free resources for youth workers on TheSource4YM.com. Jonathan, his wife Lori, and their three kids live in California.