This fun book encourages kids to practice addition and subtraction in an exciting and engaging way. Inside kids will find 25 pages with hidden pictures of animals such as tiger, giraffe, bear, honey bee, penguin and many more! Every page has a table divided into squares, and each square has a mathematical problem. To reveal the hidden pictures, solve the problems and color the squares according to the color key. The book's curriculum-based content is divided into 3 difficulty levels, suitable for children in Grades 1-2: : Add and subtract numbers within 10 : Add and subtract numbers within 20 : Add and subtract numbers within 100 Skip to the pages that suit your child's needs or start at the beginning and advance page by page — it's up to you! Also suitable for adults who want to improve their mental math ability. Large 8.5" x 11" pages printed single sided to avoid bleed-through and for easy removal and display. Suitable for coloring with pencils, crayons, markers and gel pens.