8th Birthday Gift 8 Years Old Square Root of 64 T-ShirtMachine wash cold with like colors, dry low heat Funny simple math problem age number 8yrs 8 yrs old 8th b day bday geek geeky nerd nerdy gift idea graphic tee shirt. Simple gift 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 We use high quality and Eco friendly material and Inks! We promise that our Prints will not Fade, Crack or Peel in the wash.