Wang Chaoxia Skyworth class is better and more difficult. Because it is Jiangxi People's Publishing House. This book was published and compiled by Jiangxi People's Publishing House. This book arranges the training content reasonably according to the learning order of the teaching materials. In each class, the concentrated training questions are specially trained for the calculation questions that students are not easy to understand and easy to make mistakes, which can help primary school students gradually develop the correct thinking to solve the calculation questions and fundamentally improve their ability to solve the calculation questions.