What grade is Grade B in official document mathematics?
Grade b in official document mathematics is equivalent to grade two in senior high school. Grade B of official document mathematics is the vertical addition and subtraction of two digits and three digits, which is the knowledge learned in the second book of senior two, so it is equivalent to senior two. Official Document Mathematics is a math exercise written by a high school math teacher named Official Document Palace in Japan from 65438 to 0954, with calculation as the starting point.