King of 20 Board Game Use addition, subtraction, multiplication, and division to create expressions that score points and block opponents. A fun way for students to measure and improve on their math skills in the classroom, and at home Can be played competitively by people of all ages and skill levels, and is a great addition to family game night. Requires little setup and the rules are straightforward and easy to understand. Great way for an entire family to spend time together learning and having fun