In daily spoken English, scores describe parts of a certain size, such as one-half, five-eighths and three-quarters. Molecules and denominators are also used for uncommon fractions, including compound fractions, complex fractions and mixed numbers. Grades are learned in the third grade of primary school.

Fraction indicates the fraction of one number to another, or the ratio of one event to all events. Divide the unit "1" into several parts on average, and the number representing such a part or parts is called a fraction. The numerator is above and the denominator is below.

Precautions:

The denominator must not be 0, because the denominator is equivalent to a divisor. Otherwise, the equation cannot be established, and the molecule can be equal to 0, because the molecule is equivalent to the dividend. It is equivalent to dividing 0 by any number. No matter what the denominator is, the answer is 0.

(2) The numerator or denominator in a fraction cannot have irrational numbers (such as the square root of 2) after reduction, otherwise it is not a fraction.