In the process of preparing for the exam in Changsha, although there is not much knowledge to be memorized in mathematics subjects, it is often a thousand miles away. Therefore, in the process of preparing for math, we must remember the basic knowledge and formulas accurately. The basic knowledge of mathematics in Changsha stage is sorted out for students' reference.

What's the approximate score?

Meaning: Changing a fraction into a fraction equal to it, but with smaller numerator and denominator, is called fractional reduction. (that is, the numerator and denominator of a fraction are divided by the common factor at the same time, and the value of the fraction remains unchanged. This process is called division. )

Simplest fraction: A fraction whose numerator and denominator are prime numbers (denominator is not 1) is called simplest fraction (also called reduced fraction).

Note: Try to count with your mouth when dividing points. Generally, the numerator sum is used to convert a fraction into a fraction equal to it, but the numerator and denominator are relatively small, which is called reduction. The common divisor of denominator (except 1) removes the numerator and denominator of the fraction; Usually, we have to separate it until we get the simplest score.

(The divisor is crossed out, such as 6, 12, 30, 15 in this example).

Divisor is to find its common divisor, that is, the common divisor of numerator and denominator. You can't just simplify the denominator or numerator. The common divisor of even numbers must be 2, so you can divide by 2 first, then divide slowly, and then add up all the divisors you divide to be their greatest common divisor.

The process of turning a fraction into the simplest fraction is called approximate fraction.

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