When I was in primary school, I only played. What knowledge would I summarize? But after not summarizing the knowledge points, I want to make everyone's learning structured. The following is what formulas must be memorized in primary school mathematics, which I compiled for you, for reference only. Welcome to read.

What are the formulas of triangle area = bottom × height ÷2 in primary school mathematics? S= a×h÷2?

Square area = side length × side length formula S= a×a

Area of rectangle = length× width Formula S= a×b

Area of parallelogram = base× height Formula S= a×h

Trapezoidal area = (upper bottom+lower bottom) × height ÷2 Formula S=(a+b)h÷2

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

Cuboid volume = length× width× height formula: V=abh

Volume of cuboid (or cube) = bottom area × height formula: V=abh.

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

Circumference = diameter × π formula: L=πd=2πr

Area of circle = radius × radius× π formula: S=πr2.

Surface (side) area of cylinder: The surface (side) area of cylinder is equal to the perimeter of bottom multiplied by height. Formula: S=ch=πdh=2πrh.

Surface area of cylinder: the surface area of cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends. Formula: S=ch+2s=ch+2πr2.

Volume of cylinder: the volume of cylinder is equal to the bottom area multiplied by the height. Formula: V=Sh

Volume of cone = 1/3 bottom× product height. Formula: V= 1/3Sh

Law of fractional addition and subtraction: Fractions with the same denominator are added and subtracted, only the numerator is added and subtracted, and the denominator remains the same.

Fractions of different denominators are added and subtracted, first divided, then added and subtracted.

The multiplication of fractions is: use the product of molecules as numerator and the product of denominator as denominator.

The law of division of fractions: dividing by a number is equal to multiplying the reciprocal of this number.

Extended reading: the area of all mathematical formulas triangles in the sixth grade of primary school = bottom × height ÷2. The formula S= a×h÷2.

Square area = side length × side length formula S= a×a

Area of rectangle = length× width Formula S= a×b

Area of parallelogram = base× height Formula S= a×h

Trapezoidal area = (upper bottom+lower bottom) × height ÷2 Formula S=(a+b)h÷2

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

Cuboid volume = length× width× height formula: V=abh

Volume of cuboid (or cube) = bottom area × height formula: V=abh.

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

Circumference = diameter × π formula: L=πd=2πr

Area of circle = radius × radius× π formula: S=πr2.

Surface (side) area of cylinder: The surface (side) area of cylinder is equal to the perimeter of bottom multiplied by height. Formula: S=ch=πdh=2πrh.

Surface area of a cylinder: the surface area of a cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends. Formula: S=ch+2s=ch+2πr2.

Volume of cylinder: the volume of cylinder is equal to the bottom area multiplied by the height. Formula: V=Sh

Volume of cone = 1/3 bottom× product height. Formula: V= 1/3Sh.

Law of fractional addition and subtraction: Fractions with the same denominator are added and subtracted, only the numerator is added and subtracted, and the denominator remains the same. Add and subtract fractions with different denominators, divide first, then add and subtract.

Multiplication of fractions: use the product of molecules as numerator and the product of denominator as denominator.

Division of fractions: dividing by a number is equal to multiplying the reciprocal of this number.

-Axiom theorem

First of all, arithmetic.

1. additive commutative law: Two numbers are added to exchange the position of addend, and the sum is unchanged.

2. Law of addition and association: When three numbers are added, the first two numbers are added first, or the last two numbers are added first, and then they are the same as the first number.

Three numbers add up, and the sum remains the same.

3. Multiplication commutative law: two numbers are multiplied, the position of the exchange factor and the product are unchanged.

4. Multiplication and association law: When three numbers are multiplied, the first two numbers are multiplied, or the second two numbers are multiplied first, and then the third number is multiplied, and the product remains unchanged.

5. Multiplication and distribution law: When two numbers are multiplied by the same number, you can multiply the two addends by this number respectively, and then add the two products, and the result remains unchanged. For example, (2+4)×5=2×5+4×5.

6. Nature of division: In division, the dividend and divisor are expanded (or reduced) by the same multiple at the same time, and the quotient remains unchanged. Divide 0 by any number that is not 0 to get 0.

7. Equation: An equation in which the value on the left of the equal sign is equal to the value on the right of the equal sign is called an equation. The basic property of the equation is that both sides of the equation are multiplied (or divided) by the same number at the same time, and the equation still holds.

8. Equations: Equations with unknowns are called equations.

9. One-dimensional linear equation: An equation with an unknown number of 1 is called a one-dimensional linear equation.

Learn the example method and calculation of linear equation of one variable, that is, substitute χ into the formula to calculate.

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

1 1. Addition and subtraction of fractions: add and subtract fractions with the same denominator, only add and subtract numerators, and the denominator remains unchanged. Add and subtract fractions with different denominators, divide first and then add and subtract.

12. Score comparison: Compared with the denominator score, divide the scores of different denominators first and then compare them; If the numerator is the same, the denominator is big and small.

13. Fractions are multiplied by integers, and the numerator is the product of the multiplication of fractions and integers, and the denominator remains unchanged.

14. Fractions are multiplied by fractions, the product of numerator multiplication is numerator, and the product of denominator multiplication is denominator.

15. Fraction divided by integer (except 0) equals fraction multiplied by the reciprocal of the integer.

16. True fraction: The fraction with numerator less than denominator is called true fraction.

17. False fraction: the fraction with numerator greater than denominator or numerator equal to denominator is called false fraction. False score is greater than or equal to 1.

18. With score: write a false score as an integer and a true score, which is called with score.

19. The basic nature of the fraction: the numerator and denominator of the fraction are multiplied or divided by the same number at the same time (except 0), and the size of the fraction remains unchanged.

20. A number divided by a fraction is equal to the number multiplied by the reciprocal of the fraction.

2 1.A divided by b (except 0) equals the reciprocal of a multiplied by b.