Celebrate turning 13 with this clever math pun t-shirt! The shirt features the square root of 169 ("root 169"), which equals 13, surrounded by various mathematical equations and symbols. It's a fun and unique way to mark the special occasion. Made from a comfortable, soft fabric, this shirt is perfect for casual wear. The design is eye-catching and makes a great conversation starter. Show off your love for math and birthdays with this awesome tee. Ideal for math enthusiasts, students, or anyone who appreciates a good pun!