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The least common denominator of 4,16, and 8 is 16 since 4,16, and 8 are all factors of 16. The least common denominator is an obejct known as the least common multiple (LCM) of the denominators. The reason you might want to know this is because there are standard techniques to find the LCM and also many calculator and web programs will compute it for you.

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Q: What is the least common denominator for 3 over4 7 over 16 and 5 over 8?
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