Caldecott Honor winner Grace Lin celebrates math for every kid, everywhere After playing in the snow, Olivia and Mei are ready for cocoa. There's one marshmallow for Olivia and one marshmallow for Mei. But what will they do with the third marshmallow? How can two friends share three things fairly? Storytelling Math celebrates children using math in their daily adventures as they play, build, and discover the world around them. Joyful stories and hands-on activities make it easy for kids and their grown-ups to explore everyday math together. Developed in collaboration with math experts at STEM education non-profit TERC, under a grant from the Heising-Simons Foundation.