The addition and subtraction of fractions with different denominators is a common problem encountered in mathematics, and it is also a difficult point for students to learn Xi and fraction operations. Mastering the rules and techniques of addition and subtraction of fractions with different denominators will help students better understand and apply fractions. The calculation method of the addition and subtraction of different denominator fractions is described in detail below.
Scores
The first step in addition and subtraction of fractions with different denominators is the common denominator, that is, finding the least common multiple of two fractions as the common denominator. After the score, the two different denominator fractions become the same denominator fractions, which is convenient for addition and subtraction.
Addition and subtraction
After the score is passed, it is calculated according to the rules of addition and subtraction of fractions with the same denominator. The fraction of the same denominator is added, the numerator is added, and the denominator remains unchanged;The fraction of the same denominator is subtracted, the numerator is subtracted, and the denominator remains the same.
Approximation
After the calculation is completed, if the result is not the simplest score, you need to reduce the score. Reduction is the division of both the numerator and the denominator by their greatest common divisor to get the simplest fraction.
When adding and subtracting different denominator fractions, you also need to pay attention to the following:
The result should be the simplest fraction.
When dividing, make sure that you find the least common multiple to avoid overcomplicating the calculation process.
For addition and subtraction with fractions, you can convert the fractions with fractions to false fractions first, and then perform general fractions and addition and subtraction operations.
Xi the rules and skills of addition and subtraction of different denominator fractions requires more practice and consolidation. Through a large number of practice Xi, students can master the calculation method of addition and subtraction of different denominator fractions and improve their numeracy ability. 100 help plan