2. Fractional division 2. Integer and decimal elementary arithmetic and application problems: 1. Integer and decimal elementary arithmetic.
2. Application question 3. Calculation of polygon area: 1. Calculation of parallelogram area.
2. Calculation of triangle area 3. Calculation of trapezoidal area
*4. Calculation of combined graphic area. Simple equation: 1. Use letters to represent numbers.
2. Solve simple equations
3. Equation application problems are OK.