There is a lot of new knowledge in the second book of second grade mathematics, such as the data collection and arrangement of the first unit, the division of one digit, knowing the number within 10 thousand, elementary arithmetic, grams and kilograms, etc. It is a little difficult to collect and sort out the materials to be learned at the beginning of school, but it is no problem to follow the teacher's teaching progress.
Mathematics is a discipline that studies related concepts such as quantity, structure, change, space and information.