Rules. Addition and subtraction of fractions.

**To add two fractions, it is necessary:**

- to reduce fraction to a least common denominator;
- add the numerators and put the answer over the same denominator;
- simplify the fraction;
- to convert improper fractions to mixed numbers if needed.

**To subtract two fractions, it is necessary:**

- to reduce fraction to a least common denominator;
- subtract the numerators and put the answer over the same denominator;
- simplify the fraction.