The workbook of addition and subtraction in less than 20 years was published by Jilin Photography Publishing House on February 1 2008, which mainly tells a comprehensive summary and review of children's learning of mathematics and language knowledge during the whole kindergarten period. A book in hand is a necessary teaching aid to take the entrance examination of famous schools. The setting of content and style emphasizes self-training and repeated practice, so that children can firmly grasp the knowledge points through gradual and repeated improvement of learning methods. The exercise book of addition and subtraction within 20 is divided into two parts: the basic part and the improvement part, which is in line with the child's acceptance. The addition and subtraction exercise book within 20 years is compiled according to the first-grade textbook of Kindergarten Education Outline (Trial) and New Curriculum Standard for Primary School Students, so that children can successfully pass the stage of "young convergence" and easily stay ahead of the starting line.