Player one starts by saying a number between 1 and 10. The next player says a number greater than the number previously mentioned that is up to 10 numbers higher. Alternate turns until one person eventually wins by saying "100."
Questions for Students:
- Does it matter if you go first or second?
- If your opponent says "84," what is the best choice for you?
- If your opponent says "71," what is the best choice for you?
NCTM Standard: Problem Solving
Grade level: Grades 3-8
Number of players: 2
Materials: paper, pencil
Source: National Council of Teachers of Mathematics