The difficulty of comparing the difficulty of the second volume and the difficulty of the first volume of mathematics in the sixth and third grades of Qingdao Edition will increase, as follows:

1, the second volume will involve more complicated fraction operation, which requires students to master the basic concepts and operation methods of fractions.

2. The second volume will involve operations such as addition, subtraction, multiplication, division and size comparison of decimals, requiring students to master the basic concepts and operation methods of decimals.

3. The second volume will involve the calculation of the area and perimeter of triangles and quadrilaterals, which requires students to master relevant formulas and calculation methods.

4. The second volume will involve statistics and analysis of data, requiring students to master relevant statistical methods and draw charts.