Final answer:
To add or subtract fractions, find a common denominator and perform the operation on the numerators while keeping the denominator the same.
Step-by-step explanation:
When adding or subtracting fractions, it is important to find a common denominator. The lowest common multiple (LCM) of the denominators is the least common denominator (LCD). You can then convert the fractions to have the same denominator by multiplying the numerators and denominators by the appropriate factor. Once the fractions have the same denominator, you can add or subtract the numerators and keep the denominator the same.