1, general division. Convert the denominator of two or more fractions into the same number, then add or subtract their molecules, and finally convert the result into the simplest fraction or integer. For example, if 1/3 and 2/5 are converted into integers, we can divide their denominators into 15, then add their molecules to get11/5, and finally add11/.
2, the province points method. Multiply the value of numerator and denominator to make the original fraction become a new fraction, both numerator and denominator are integers, and the value of the new fraction is equal to the value of the original fraction, thus obtaining an integer.
Fraction originally refers to a part of the whole, or more generally, to any equal number of parts. The form of expression is the ratio of integer A to integer B (whether a false score in multiples of b is a score is controversial).
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.
Points for attention:
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.
③ Only two prime factors (2 and 5) in the denominator of the simplest fraction can be converted into finite decimals; If the denominator of simplest fraction only contains prime factors other than 2 and 5, it can become a pure cyclic decimal; If the denominator of simplest fraction contains both prime factors of 2 or 5 and prime factors other than 2 and 5, it can be converted into mixed cyclic decimals.