1, formula: addition, subtraction, multiplication and division.

2. The understanding of triangle, the calculation formula of triangle area and the calculation formula of triangle perimeter.

3. The formula for calculating the perimeter of the rectangle and the formula for calculating the area of the rectangle.

4. The understanding of the circle, the formula for calculating the area of the circle, the formula for calculating the circumference of the circle and the formula for calculating the surface area of the cylinder.

5. Decimals and fractions. Scores include scores, false scores and true scores.

6. Understanding and application of percentage.

7. Understanding ratio, simplifying ratio and seeking ratio.

8. Formula for calculating square area and formula for calculating square perimeter.

9. What is a linear equation with one variable? A: A linear equation with an unknown number and an unknown degree.

Example method and calculation of learning linear equation of one variable. That is, an example is given to illustrate that the formula is replaced by χ and calculated.

10, fraction: divide the unit "1" into several parts on average, and the number representing such a part or points is called a fraction.

1 1, addition and subtraction of fractions: add and subtract fractions with denominator, only add and subtract numerators, and the denominator remains unchanged. Fractions of different denominators are added and subtracted, first divided, then added and subtracted.

12, comparison of fractional size: Compared with the fraction of denominator, the numerator is large and the numerator is small.

Compare the scores of different denominators, divide them first and then compare them; If the numerator is the same, the denominator is big and small.

13, the fraction is multiplied by the integer, and the product of the numerator of the fraction multiplied by the integer is the numerator, and the denominator remains unchanged.

14, the fraction multiplied by the fraction, the product multiplied by the numerator is the numerator, and the product multiplied by the denominator is the denominator.

15, the fraction divided by an integer (except 0) is equal to the fraction multiplied by the reciprocal of this integer.