Not difficult. It is not difficult for a famous teacher to create an evaluation paper for seventh grade mathematics improvement with complete content, moderate difficulty and comprehensive questions. Master's original mathematics is a book published by Jiangsu Education Press on 20 1 1, which has the characteristics of new curriculum standards, new textbooks, new ideas, new thinking, new teaching methods, new learning methods and new resources. Units include percentage, cylinder and cone, proportion, application of positive proportion and negative proportion.