Least Common Denominator of 35, 39 and 42 (LCD of 35, 39 and 42)

Least Common Denominator (LCD) of 35, 39, and 42

The Least Common Denominator of 35, 39 and 42, also known as the Lowest Common Denominator of 35, 39 and 42, is useful if you need to add, subtract, or compare three fractions with the denominators of 35, 39 and 42.

The fractions with 35, 39 and 42 denominators will look like this:

		X
		35

		Y
		39

		Z
		42

The Least Common Denominator of 35, 39 and 42 is 2730.

You need to multiply 35 by 78, 39 by 70, and 42 by 65 to make them all 2730. 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:

		X x 78
		35 x 78

		Y x 70
		39 x 70

		Z x 65
		42 x 65

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

		78X
		2730

		70Y
		2730

		65Z
		2730

You can substitute X, Y and Z with the numerators of your fractions with 35, 39 and 42 denominators. This way you can add, subtract and compare your fractions correctly.

Least Common Denominator Calculator
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Least Common Denominator (LCD) of 35, 39 and 43
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Notes

The Least Common Denominator of 35, 39 and 42 is the same as the Least Common Multiple of 35, 39 and 42.

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