Yaya, a first-year math book, ranked fifth and fourth. According to relevant information, from the left, Yaya ranks fifth. From the right, Yaya ranks fourth. Mathematics for Grade One is a book published by East China Normal University. The writer is East China Normal University Press. 1 Grade Mathematics (1 semester) (East China Normal University Edition) adheres to the guidance of people's cognitive thinking mode, scientifically sets the style, and allows students to learn knowledge step by step and systematically. Step by step, improve your ability efficiently.