The illustrations of primary school mathematics textbooks published by People's Education Publishing House were widely concerned by the society, and the Ministry of Education instructed People's Education Publishing House to rectify them immediately, so they were gone. The second grade mathematics mainly studies multiplication and division in tables, the reading and writing of numbers within 10,000, and the addition and subtraction of numbers within 10,000 (without carry and abdication), including the two-step calculation of addition, subtraction, multiplication and division and the understanding of brackets, that is, the two-step calculation law of simple elementary arithmetic.