Each read-aloud book in the Mouse Math series focuses on a single, basic math concept and features adorable mice, Albert and Wanda, who live in a People House. Entertaining fiction stories capture kids’ imaginations as the mice learn about numbers, shapes, sizes and more. Over 3 million copies sold worldwide! When the People go away to the beach, Albert decides to make a beach of his own in the backyard sandbox. The only problem is—how to fill up his "beach" with water?  Every Mouse Math title includes back matter activities that support and extend reading comprehension and math skills, plus free online activities. (Math concept: Volume/Capacity)