Remember when elementary school math was just apples and oranges? Well, we brought it back—only now it’s cooler, cleverer, and wearable. Sum Shirts combine 2 to 5 everyday words (or phrases) into one perfectly punny equation. It’s not rocket science (thankfully), but it is ridiculously fun. Add ‘em up, show ‘em off, and get ready for people to do a double-take at your clever shirt math. Who knew addition could be this amusing?