Appropriate grades or age groups:
Elementary School
Middle School
High School & Beyond

Estimated time to complete project or implement technique:
2 minutes to indefinite

Materials needed (if applicable):
None

Project instructions or description of technique:
We usually play this game while traveling but it can be done anywhere, anytime. One person is "it" and thinks of a number, for us it has always been a whole number, usually between 0 and 500 but it can be altered to fit the abilities of the players. Others either jointly or by taking turns ask questions in order to discover the number in as few possible guesses. Examples of questions would be : Is it divisible by 5? Is it a three digit number? Is it a one digit number? Is the last digit less than 5? Is it greater than or equal to ____? The winner gets to be next "It" Or to erase competitiveness and allow everyone a chance simply prearrange an order of who will be it. This can occuppy young minds (or old!) for quite a while.

Other suggestions or comments:
When this game becomes tiring, sing 99 bottles of Coke on the wall!