Meaning: It is called reduction to change a fraction into a fraction equal to it, but with smaller numerator and denominator.

Simplest fraction: The numerator and denominator are fractions of prime numbers, which are called simplest fraction.

Note: In addition to time-sharing, try to calculate by mouth, and generally use the common divisor of the numerator and denominator (except 1) to remove the numerator and denominator of the fraction; Usually, we have to separate it until we get the simplest score.

★ If you can see the greatest common divisor of numerator and denominator quickly, it will be easier to divide them directly.

Writing:

2

six

12

—

30

15

five

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

References:

1. Primary School (West Normal University Edition) Mathematics Volume 10

2. The fifth grade mathematics in primary school (Volume II)