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The formula of the same denominator fraction in the first volume of the third grade mathematics
Add the fraction and denominator, the denominator remains the same, the numerator is added, and finally it becomes the simplest fraction.

Example:

2/9+5/9

=2+5/9

=7/9

Subtract the denominator fraction, the denominator remains the same, and the numerator is subtracted, which will eventually become the simplest fraction.

Example:

5/9- 1/9

=5- 1/9

=4/9

Steps to reduce:

1, numerator and denominator decomposition factor.

2. Find the common factor of numerator and denominator.

3. Exclude non-zero common factors.

If the greatest common divisor of numerator and denominator can be seen quickly, it is easier to divide by their greatest common divisor directly.