Personalized Teachers Count Youth Long Sleeve T-Shirt. Math Teachers Count 1-2-3-4-5-6-7-8-9 is a humorous twist on words and a funny gift design for birthdays, holidays and graduation. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)