According to the basic properties of fractions (formulas), the process of converting several fractions (formulas) with different denominators into fractions (formulas) with the same denominator is called total score.

Total grades: 1/3 and 1/4.

Solution: The least common multiple of 3 and 4 is 12.

1/3 = 4/ 12

1/4 = 3/ 12

Then the scores are 4/ 12 and 3/ 12.

That is, the denominators of the two fractions are changed into their least common multiples, the numerator and denominator are multiplied by a number at the same time, the numerator and denominator of 1/3 are multiplied by 4, and the numerator and denominator of 1/4 are multiplied by 3, so that the sizes of the two fractions can be compared.