Personalized Teachers Count Youth 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. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.