Show off your quirky sense of humor with this black graphic tee! The shirt features a clever math joke with '√169 = 13 YEARS OLD' displayed prominently in yellow and white, making it a standout piece. Perfect for math enthusiasts or anyone celebrating their 13th birthday, this tee combines comfort and style with a touch of wit. Made from soft and breathable fabric, it's ideal for casual wear, parties, or gifting. Grab this unique shirt and let the numbers do the talking!