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Since 21 is divisible by 3, the least common denominator of 3 and 21 is 21.

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10y ago
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10y ago

3/21 is equal to 1/7, so your question does not make sense.

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Wiki User

11y ago

21

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Q: What is the lcd of 7 and 21?
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Related questions

What is the LCD of 3 and 7?

21


What is the LCD of 7 and3?

21.


What is the LCD of 7 21 and 6?

It is 42


What is the lowest common denominator of 8 21 and 7?

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What is the LCD of 18 and 21?

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What is the least common denominator of 21 and 7?

The Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. I assume the 7 and 21 are the denominators of two fractions you need to add or subtract.LCD(7, 21) = 21.


The answer for six out of seven minus four out of twenty one?

Put as 6/7 - 4/21, change to LCD: 18/21 - 4/21, which is 14/21, or 2/3


What is the LDC for 11 over 7 and 3 over 8?

I think what you might have meant was LCD (Lowest Common Denominator) The LCD for 11/7 and 3/8 is 56 Making equivalent fractions using the LCD: 11/7 becomes 88/56 3/8 becomes 21/56