Website Address: https://library.curriki.org/oer/Dan-Meyer-s-Three-Act-Math-Tasks-309724
Collection of videos and three part math lessons from Dan Meyer (http://blog.mrmeyer.com/about-2/), Chief Academic Officer at Desmos. He uses storytelling to teach math as "Storytelling gives us a framework for certain mathematical tasks that is both prescriptive enough to be useful and flexible enough to be usable. Many stories divide into three acts, each of which maps neatly onto these mathematical tasks."