Sports Math, Lesson 3, Subtraction, Introduction to Sub-track-tion (girls’ track) Approximate working time 20 minutes per lesson. Propel your Math Students into the Exciting World of Sports, while adding the elements of familiarity, excitement, and relevancy to basic math skills instruction. Focus sharply on the four basic operations while systematically developing each step in small sequential steps of increasing difficulty. This lesson can be printed from and listened to and shared via a var