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You can use any common multiple of 2 and 4. The easiest (for subsequent calculations) to use is the lowest common multiple, which for 2 and 4 is 4.

→ 1/2 = 2/4

→ 3/4 = 3/4 (it already has 4 in the denominator)

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9y ago
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Q: What is the common denominator of 1-2 and 3-4?
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