1, triangle area = base × height ÷2, formula: S=a×h÷2.

2. The square area = side length × side length, and the formula is: s = a× a.

3. The area of a rectangle = length× width, and the formula is: s = a× b.

4. The area of parallelogram = base× height, and the formula is: s = a× h. ..

5. Trapezoidal area = (upper bottom+lower bottom) × height ÷2, formula: S=(a+b)h÷2.

6. Sum of internal angles: sum of internal angles of triangle = 180 degrees.

7. cuboid volume = length × width × height, formula: V=abh.

8. Volume of cube = side length × side length × side length, formula: V=aaa.

9. The circumference of a circle = diameter × π, and the formula: L = π d = 2π r.

10, area of circle = radius × radius× π, formula: S=πr? .

1 1, the surface area of the cylinder = the perimeter of the bottom times the height plus the area of the circles at both ends, and the formula is: S=ch+2s=ch+2πr? .

12, volume of cylinder = bottom area times height, formula: V=Sh.

13, the law of addition and subtraction of fractions: add and subtract fractions with the same 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.

14, multiplication of fractions: use the product of molecules as numerator and the product of denominator as denominator.

The above are some mathematical formulas for grades 1 to 6.

Primary school mathematics learning methods;

1, create a learning atmosphere with interest first. In order to avoid the resistance of learning mathematics, we should first pay attention to the cultivation of interest, which is also the key to enlightenment education. For example, digital games, find a math teacher that children like, and use a set of the most authoritative textbooks.

2. Pay attention to the cultivation of children's computing ability. Addition and subtraction within 20 is a very important basic knowledge. Children must learn well and reach the level of skilled calculation. Therefore, parents need to be conscientious and practice more.

3. Master the basic knowledge of clever calculation and fast calculation. Calculation is the first problem that students encounter when they study. To learn math well, they must first pass the calculation. If we can find some rules in the seemingly chaotic formula and simplify it, then students will definitely enhance their confidence and interest in learning mathematics.

4. Pay attention to the cultivation of study habits. The cultivation of mathematical ability is mainly carried out in the classroom, so we should pay special attention to the learning efficiency in the classroom and seek the correct learning methods. Keep up with the teacher's thinking in class, actively develop thinking and predict the next steps, and review in time after class.