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Adding Fractions (with common or uncommon denominators)


Adding Fractions with Common or Like Denominators

When we add fractions that have the same, or common denominators, we add only the numerators. The denominators stay the same.

Example :

Adding Fractions With Uncommon or Unlike Denominators

To add fractions with uncommom denominators, we need to change the fractions to equivalent farctions with common denominators before we find the sum.

First, we would need to find the least common denominator (LCD), which is the LCM of the denominators.

Next, we write equivalent fractions using the least common denominator. Then, we proceed to add as before.




Step 1 :Find the LCD or LCM of 2 and 5

Multiples of 2: 2, 4, 6, 8, 10, 12

Multiples of 5: 5, 10, 15

The LCD or the Least Common Multiple of 2 and 5 is 10

Step 2 : Write both fractions and as equivalent fractions with a common denominator of 10.

Step 3: Add the 2 equivalent fractions.

The following video shows more examples of adding fractions with uncommon or unlike denominators.

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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