khanacademy

This super cool 3rd grader just came up to me and said " I know how to add mixed numbers now." I gave her a problem to prove it and she nailed it! Funny, I don't remember teaching that. Thank you @khanacademy #no limits #mathiseasy @BocaRatonElem pic.twitter.com/C9ytKwHVW0

— Theo Wiles (@theo_wiles) February 28, 2018