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There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.

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Considering your question is asking about the numbers 2, 5 & 9 :

The denominators here do not share a common factor.

Multiply the denominators: 2×5×9 = 90.

Since 2, 5 and 9 are factors of 90 and neither is a factor of the other, 90 is the least common denominator (LCD).

Considering the numbers 25 & 9 :

Multiply the denominators: 25×9 = 225

Since 25 and 9 are factors of 225 and neither is a factor of the other, 225 is the LCD

Q: What is the least common denominator of 2 5 and 9?

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The least common denominator (LCD) is 630.

A common denominator, though not the least, is 30.

60

You need at least one more fraction in order to have a common denominator.

At least two fractions are needed to determine a common denominator.

Related questions

The least common denominator (LCD) is 630.

Sir/Ma'am, denominator are fractions, so the is no common denominator. But the least common multiples is 30

A common denominator, though not the least, is 30.

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The least common denominator of 2, 5 and 7 is 70. Since all those numbers are prime, the answer is their product.

A common denominator, though not the least one, is 120.

What is the least common denominator? For one over five and 3/6

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20

The least common denominator is 60.

Least common denominator of 7 and 5 is 35.

At least two fractions are needed to answer this.