The problems in the fourth grade of elementary school in Singapore are mostly based on basic addition, subtraction, multiplication and division, while the problems in the fourth grade of elementary school in China have been extended to formula calculation and equation, so the mathematics in the fourth grade of elementary school in Zhejiang is more difficult.

The International Association for the Evaluation of Educational Achievement is an international educational research cooperation organization, which is mainly engaged in the comparative study of educational policies and practices, and promotes exchanges and learning among global educational systems. As for education in China, because we are all trained by China Institute of Education, many colleagues have served in the field of education in China for many years, so it is our duty to criticize. However, in today's international situation, there are many new educational facilities and theories in the world that deserve our full attention, understanding and learning. We should also introduce them to the world as much as possible for comparison and selection. Education is a tool to help people plan their lives, and good education is often a sign of good society. Those who pursue light, please pursue the most reasonable and brightest education in the world. Maybe I can lend you some knowledge in this small monthly magazine.