Assuming those are denominators of fractions you wish to add or subtract, you can use any common multiple of 4 and 14; the Lowest Common Multiple (LCM), often called the Lowest Common Denominator (LCD) especially when when referring to the denominators of fraction, provides the smallest numerators.
For 4 and 14, the LCM is 28.
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The common denominator is 28.
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What would be the ideal Common Denominator for 2 and 4?
The LCM is 52
You need at least one more fraction in order to have a common denominator.