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The LCD, or Lowest Common Denominator, is the smallest multiple of each of the denominators of a set of fractions. So, assuming that 2, 4 and 5 are denominators of fractions (1/2, 1/4 and 1/5, for example), the LCD would be 20, because 20 is the lowest number that 2, 4 and 5 multiply into. So, your new fractions would be 10/20, 5/20 and 4/20. The purpose of finding the LCD is to allow for multiplying fractions together, or simply comparing them easily.

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13y ago
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12y ago

The least common multiple of 2, 4, and 7 is 28.

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Wiki User

12y ago

LCD(4, 7, 12) = 84

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bob

Lvl 2
3y ago

84

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bob

Lvl 1
3y ago
WOW BOB! THANKS!
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bob

Lvl 1
3y ago
NO PROBLEMO

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Wiki User

12y ago

28

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Q: What is the lcd of 7 4 and 2?
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