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How do you find the least common denominator of 5 over 7 and 5 over 6 and and 3 over 4?
Wiki User
∙ 14y ago
The LCD is the Least Common Multiple of all denominator.
To find the LCM, factor all three numbers
7 is prime
6 is [3 2]
4 is [2 2]
Multiply all three numbers to get 168, but since 6 and 4 have a 2 in common, divide the total by 2 to get 84.
Your new fractions are (60 / 84) (70 / 84) and (63 / 84)
A quick way to find 84 is to take the two highest numbers and multiply them together. Check to see if the lowest number can divide it. If it cannot, add another multiple of what you got. For example here, 7*6 is 42, but 4 does not divide it, so add another 42 to get 84. now 4 divides it, so that is the answer.
Wiki User
∙ 14y ago
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