1+2=3 is an online HTML5 game presented by yiv.com, it's playable in browsers such as safari and chrome. You can play the game on smartphone and tablet (iPhone, iPad, Samsung, Android devices and Windows Phone). 1+2=3 is a simple math game for everybody. How fast can you add and subtract? Are you smarter than a 1st grader? 70.07% of 1290 players like the mobile game.