Personalized Math Counts White Youth Long Sleeve T-Shirt. 1, 2, 3, 4, 5 ...Math, the only subject that counts is a humorous math design with a double meaning. Fun gifts for mathematicians, students and teachers at birthdays, holidays, graduation and back to school. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)