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What are the skills of mathematical reduction in grade five?
(1) When the numerator and denominator of the fraction are both 0, 2, 4, 6, 8. Not the simplest fraction, there must be a common factor of 2.

(2) When the numerator and denominator of a fraction are both 0 or 5, it is not the simplest fraction, and there must be a common factor of 5.

(3) When the sum of the numerator and denominator of a fraction is divisible by 3, it is not the simplest fraction, and there must be a common factor of 3.

(4) When the numerator and denominator are not above, it depends on whether there is a common factor of 7, 1 1, 13, 17, 19.

Method of restoration:

1, numerator denominator decomposition factor;

2. Find the common factor of numerator and denominator;

3. Exclude non-1 common factor.

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