Home Misspellings How to spell addittion? Addittion or addition? Which one is correct? by hersey January 12, 2017 Reading Time: 0min, 7sc + - 0 Addittion or Addition Which one is correct? You can find the answer below. Incorrect Addittion Correct Addition You can find more information about Addition word here. Rate this post Correct spelling of addittionHow do you spell addittion?