Xinhua Bookstore can find, "Talents lead exploration and practice in the new century?" Talent course: Challenge Olympic Mathematics and Thinking Development Training (Grade Three) (North Mathematics) A set of test questions carefully compiled to analyze and grasp the thinking of primary school students. It is based on practical principles, aiming at the difficulties, key points, test sites and places that students are easy to confuse and misuse, and interprets the same question through different thinking, helping students to clear the fog of grammar learning.