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What are the quick calculation methods of primary school mathematics?
There are many quick calculation methods for primary school mathematics. Here are some common quick calculation methods:

1. additive commutative law and associative law: By exchanging the positions of two numbers or changing the order of addition, the calculation process can be simplified.

2. Conversion from subtraction to addition: Conversion from subtraction to addition, for example, a-b can be converted into a+(-b) and then calculated.

3. Multiplication and distribution law: a number multiplied by the sum of two numbers is equivalent to this number multiplied by these two numbers and then added.

4. Multiplication multiple relation: multiply a number by 10, 100, 1000, etc. Moving the decimal point can simplify calculation.

5. Convert division into multiplication: convert division into multiplication, for example, A÷bcan be converted into a×( 1/b), and then calculate.

6. Simplification of fractions: Simplifying fractions into the simplest form can be achieved by finding the greatest common divisor of numerator and denominator.

7. Square difference formula: The relationship between the difference between two numbers and the square of their sum can be calculated by using the square difference formula.

8. Cubic difference formula: The cubic difference formula can be used to calculate the relationship between the difference of two numbers and their cubes.

9. Complete square number: By observing the characteristics of numbers, some complicated calculations can be converted into the form of complete square numbers, thus simplifying the calculation.

10. Fast estimation: by observing the size and order of magnitude of the number, fast estimation is carried out, so as to obtain the value close to the accurate result.