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

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9y ago
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9y 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?

LCD(18, 21) = 126


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.


What is the LCD of 5 and 7?

the LCD of 5 and 7 is explanation: 7: 14, 21, 28, 35, 42, 49, 56, 63, 70 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 so the LCD is 5 and7 is 35


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