For instance, if you know that the number is evenly divisible by 3, learning that the number is divisible by 6 with a remainder of 3 doesn't provide any new information, because any number meeting the second clue is also evenly divisible by 3. In the same way, a clue that the number is less than 185 doesn't provide any useful information if you already know that the number is less than 157. Players wishing an extra challenge might be encouraged to find the number of jellybeans without using the Solution Tester. Concentration, Magic numbers, Geometron, and Math Machine. Most of these games can be played alone or with another person.
Concentration is the familiar game of turning over pairs of tiles to find matching items.
In this version, what matters is the total number represented on the tile. In one version of Magic Numbers, Nine or Bust , players take turns rolling a die and placing that number on a three by three grid. The object is to complete a row that adds up to nine before your opponent. This game is similar to, but not as challenging or interesting mathematically as creating a Magic Square where all of the rows add up to the specified number. The object of Math Machine is to use a given set of numbers to create 10 equations whose solutions are the numbers 0 through 9.