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A common denominator is a denominator that is shared between two or more fractions. Consider a few examples.
| Pair of Fractions | Common Denominator |
|---|---|
| 2/3 and 5/3 | 3 |
| 8/10 and 5/10 | 10 |
| 11/17 and 6/17 | 17 |
Two or more fractions can always be rewritten to have a common denominator. This process requires writing equivalent fractions by expanding or simplifying the fractions.