An educational game system offers fun and effective ways to readily learn about equivalent values in prevalent measurement or counting systems. These may include fractions, percentages, decimals and degrees. This child-friendly game system can include a set of playing cards and a measure. It is a low cost yet effective math learning tool. Interchangeable indicia such as symbols, words and pictures depict face values. These make play and learning accessible to all. Addition, subtraction, multiplication and division are supported. Even players unskilled in the prevalent measurement or counting system or in the underlying math may determine a group value. Cards denote hints and game strategies. The system supports existing and original card games. It may appeal to players of all ages and levels of mathematical proficiency from novices to experts. Game developers may customize the system for any application or market.