Now in Spanish bilingual editions--Caldecott Honor winner Grace Lin celebrates math for every kid in this board book series. Mei explores measurement as she plants a sunflower seed and watches it grow. The plant starts off as tall as her toe, but soon it's up to her knees, then her waist, then her shoulders. How tall will it get? The Storytelling Math series shows that all children can be mathematical thinkers. Each book includes ideas for exploring math at home with your children, developed in collaboration with math experts at STEM education nonprofit TERC Inc., under a grant from the Heising-Simons Foundation.