This work is related to the study of divisibility by nine. The application of the Game of Nines is more of a mental exercise than a precise Control of Error. However, when presenting this material to the students, they are often fascinated by it. Any time students practice the four operations, either in the concrete or the abstract, the Game of Nines can be used as a method of probable verification. The Game of Nines is especially captivating when it is applied to multiplication and division.
• Ten laminated exercises each for addition, subtraction, multiplication, and division.
• One laminated four-part diagram card + numerals.
• One Booklet for Instructions & Control.
(Formally Called The Game of The Nine Proof)