Square Root of 169 13 yrs years old 13th birthday T-Shirt-FL

Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 65% Cotton, 35% Polyester, Imported, Machine wash cold with like colors, dry low heat, Funny simple math problem age number 13yrs 13 years old 13th b-day bday geek geeky nerd nerdy gift idea graphic tee shirt. Simple gift idea for yourself and for people you loved: her him mom dad, ladies girls boys kids and teens. Lightweight, Classic fit, Double-needle sleeve and bottom hem