The least common denominator of 4 and 5 is the smallest multiple that both numbers share. In this case, the least common denominator of 4 and 5 is simply their product, which is 20. This is because 20 is the smallest number that is divisible by both 4 and 5 without leaving a remainder.
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There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
LCD(12, 5) = 60
120.
To compare fractions, we need to have a common denominator. In this case, the common denominator for 9, 4, and 12 is 36. Converting the fractions to have a denominator of 36, we get 20/36, 27/36, and 21/36. Therefore, in order from least to greatest: 5/9, 7/12, 3/4.
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The LCD of 3, 4 and 5 is 60.