If the fractions have the same denominator, the sum of their numerators (top parts) is the numerator of the result. For the denominator (bottom part), just copy the common denominator. Example: 1/7 + 2/7 = 3/7
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The Lowest Common Denominator is needed when adding or subtracting fractions.
The first step is to find the lowest common denominator of the fractions.
You must first convert the fractions to a common denominator. Then just add the numerators (the top part of the fraction).
Same as for adding: If the denominators are not equal, you must first find a common denominator, then convert both fractions to that common denominator.
When adding or subtracting fractions with different denominators, it is necessary to find a common denominator to solve the equation. A common denominator is like a common multiple, except its function is as the bottom number in a fraction.