See also the Counting Game for a simpler version of this. Competitors pair up and hold just one hand behind their back. Choosing to show 0 to 5 digits. Both players reveal the number of fingers they are showing at a chosen signal. Whoever yells out the sum of...
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Counting Game
Have everyone in your group pair up and face each other. Each person holds up 0 to 10 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...