What do you mean by math 1, math 2, math 3 and math 4 in Hanyang contract teachers' primary school?

Hanyang contract teachers in primary school mathematics 1, 2, 3 and 4 should be teachers who teach different grades of primary school mathematics courses. Hanyang contract teachers refer to contract teachers recruited in Hanyang District, Wuhan. Primary school mathematics 1, 2, 3 and 4 refer to primary school mathematics courses of different grades. First-year students learn primary school mathematics 1, second-year students learn primary school mathematics 2, and so on. Therefore, Hanyang contract teachers 1, 2, 3, 4 should refer to teachers who teach primary school mathematics courses in different grades.