Our new engaging educational series introduces the simple adding up sums with mess-free paint with water fun! Pre-K children will have fun learning as they use the chunky paintbrush to paint and solve the adding up sums, trace the numbers, and discover the hidden color behind the friendly animal pictures. The pages feature a specially-formulated coating that reveals color when the page is painted with water. The color disappears when the page is dry, so the numbers and pictures can be painted again and again! The chunky paintbrush included with the book is perfect for little hands to hold as they trace the letters, all of which will help them develop pen control and first counting skills. The special reusable pages mean there is lots of opportunity to practice the trace and count activities. And if a mistake is made, once the picture is dry, the numbers and pictures can be traced and painted again and again!