Personalized Panda Proof That Math Teachers Multiply Funny Toddler Long Sleeve T-Shirt. funny math themed baby quote with panda says I'm proof that math teachers multiply A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.