Primary school mathematics, the score is relatively large. Generally, the topic score of the fifth grade of primary school is relatively large. There are many ways, common and simple, which are suitable for primary school students. There are two ways:

First of all, for the same denominator

First, divide two fractions with different denominators into two fractions with the same mother number, and then according to

For two fractions with the same denominator, the bigger the numerator, the bigger the fraction. Compare scores.

Analysis example: take the lowest common multiple 63 of the denominators 2 1 and 9 of the original two people as the denominators of two new fractions, and according to the basic properties of the fractions, we can get: 4/2 1 = 12/63, 2/9 = 14/63.

Because: 12/63 < 14/63, the larger the molecule, the greater the score.

So: 4/2 1 < 2/9

Second, become the same molecule. First, different molecules are changed into two fractions of the same molecule, and then according to

For two fractions with the same numerator, the larger the denominator, the smaller the fraction. Compare scores.

Analysis example: take the lowest common multiple of molecules 3 and 5 of the original two fractions as the molecules of two new fractions, and according to the basic properties of the fractions, we can get: 3/8 = 15/40, 5/ 12 = 15/36.

Because: 15/40 < 15/36, the larger the denominator, the smaller the score.

So: 3/8 < 5/ 12

hope this helps