What is Unlike Denominators?
Two fractions with non-identical denominators are known as, unlike denominators.

For example, to compare the fractions 3⁄4 and 5⁄7, we first draw the fraction models and then compare the two fractions.

Converting unlike denominators to like denominators or common denominators:
Step 1: Find the least common multiple (LCM) of the denominators.
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, …
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70,…
Step 2: Multiply both the numerator and the denominator of each fraction by a number to get the obtained LCM as the denominator.

Once the fractions have like denominators, they can be easily compared, added, or subtracted.
Example:
Compare 34 and 57 ![]() | Add 34 and57 ![]()
| Subtract 57 from 34 ![]()
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Fun Facts
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Example:
4⁄9 > 4⁄11