One person must know how to play and how it works.
You hold up one finger and say, “This is the Number Game.” Then hold up two fingers and say, “This is one.” Then 3 fingers – “This is two.” Now 4 fingers – “This is 3.” After that, hold up any number of fingers and ask, “How many is this?”
The answer/trick is that the last number of fingers you held up is the new number for the amount of fingers you hold up the next time. If you held up 4 fingers, then the next time hold up, say, 7 fingers. The actual ‘number’ is 4 instead of 7. Then hold up, say, 3 fingers. The ‘number is 7. Keep going until everyone has figured it out.
Have fun with how you hold them up; hold up 4 fingers with 2 on each hand or hold up your thumb for 1.