# Adding Fractions with Unlike Denominators

Related Topics:
More Lessons for Grade 4 Math
Math Worksheets

Videos, solutions, examples and songs to help Grade 4 students learn how to add fractions with unlike denominators.

How to add fractions with unlike denominators?
Step 1: Line the fractions up vertically.
Step 2: Find the LCD (least common denominator) which is the LCM (least common multiple) of all the denominators.
Step 3: Write the fractions with the same denominator which will be the LCD.
Step 4: Add the numerators of the new fractions.
Step 5: Simplify the fractions when necessary.
Example:
1/4 + 1/3

Adding 3 Fractions with Uncommon Denominators
Step 1: Change all fractions to have a common denominator
Step 2: Add the numerators while keeping the same denominator.
Step 3: Reduce when possible.
Example:
1/12 + 1/8 + 10/16

Adding & Subtracting Fractions Song: LIKE and UNLIKE Denominators
Finding the Least Common Denominator

Visually adding fractions with unlike denominators
Example:
5/6 + 1/4

Example:
3/5 + 1/6
12/27 + 2/9

Addition of fractions with unlike denominators
Examples:

2. The Pacific Ocean covers 1/3 of the Earth’s surface. The Atlantic Ocean covers 1/5 of the Earth’s surface. What fraction of the Earth’s surface is covered by both the Atlantic and Pacific Ocean?

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