In King of 20 players use number and operation tiles to form expressions which are placed on the game board. The goal of the game is to receive the lowest score possible by making expressions that are as close to the number 20 as possible. A player's score is determined by comparing the solution of their expression to the number 20. For example: an expression with a solution of 18 would have a score of 2. Players must use tiles already on the board and those in their hand to form or add to expressions.
King of 20 can be used as an effective educational tool or as a fun classroom game. In King of 20 players use addition, subtraction, multiplication, and division to create expressions that score points and block opponents. The simple rules allow young players be competitive on their first move. Playing King of 20 is a fun way for students to measure and improve on their math skills in the classroom, and at home. Enthusiastic players will unknowingly sharpen their math skills while they focus on defeating their opponents.