Least Common Denominator (LCD) of 7, 12, and 81
The Least Common Denominator of 7, 12 and 81, also known as the Lowest Common Denominator of 7, 12 and 81, is useful if you need to add, subtract, or compare three fractions with the denominators of 7, 12 and 81.
The fractions with 7, 12 and 81 denominators will look like this:
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The Least Common Denominator of 7, 12 and 81 is 2268.
You need to multiply 7 by 324, 12 by 189, and 81 by 28 to make them all 2268. Furthermore, you need to multiply the numerators by the same amounts to keep the fraction values the same.
Therefore, you have to make the following calculations so the fractions keep the same value and get the same denominator:
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Which gives you the following three new fractions that you can add, subtract and compare:
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You can substitute X, Y and Z with the numerators of your fractions with 7, 12 and 81 denominators. This way you can add, subtract and compare your fractions correctly.
Least Common Denominator Calculator
Please enter another two or three denominators below so we can calculate the Least Common Denominator (LCD) for you:
Least Common Denominator (LCD) of 7, 12 and 82
Here is the next set of numbers we have calculated the LCD for.
Notes
The Least Common Denominator of 7, 12 and 81 is the same as the Least Common Multiple of 7, 12 and 81.
To calculate what to multiply each denominator and corresponding numerator by, we divided the LCD by each of the denominators.