Grade one is very simple, grade two is slightly difficult, and grade three is really difficult. The second grade mathematics is different from the first grade mathematics, which plays a connecting role and needs to be firmly grasped, so it is more difficult.
Mathematics is a discipline that studies the concepts of quantity, structure, change, space and information, and belongs to a formal science from a certain point of view. Mathematics is produced by counting, calculating, measuring and observing the shape and motion of objects through abstract and logical reasoning.