Least Common Denominator of 8 and 42 (LCD of 8 and 42)

Least Common Denominator (LCD) of 8 and 42

The Least Common Denominator of 8 and 42, also known as the Lowest Common Denominator of 8 and 42, is useful if you need to add, subtract, or compare two fractions with the denominators of 8 and 42.

The fractions with 8 and 42 denominators will look like this:

		X
		8

		Y
		42

The Least Common Denominator of 8 and 42 is 168.

You need to multiply 8 by 21 and 42 by 4 to make them both 168. 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 values and get the same denominator:

		X x 21
		8 x 21

		Y x 4
		42 x 4

Which gives you the following two new fractions that you can add, subtract and compare:

		21X
		168

		4Y
		168

You can substitute X and Y with the numerators of your fractions with 8 and 42 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 8 and 43
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Notes

The Least Common Denominator of 8 and 42 is the same as the Least Common Multiple of 8 and 42.

To calculate what to multiply each denominator and corresponding numerator by, we divided the LCD by each of the denominators.