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Q: What is the least common denominator of 20 and 15 and 9?

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The least common denominator (LCD) is 1.

60

60

A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.

Least common denominator is used for fractions, not integers. Integers can be expressed as fractions, though, by placing them over 1 so if you really meant least common denominator then the answer is 1. If, however, you meant least common multiple, then then answer is 60.

LCD(8, 20, 15) = 120

The is no "largest" common denominator. For any denominator you find, we can multiply it by a natural number and come up with a larger one. Do you mean LEAST COMMON DENOMINATOR?

A common denominator, though the least, is 260.

A common denominator, though not the least one, is 12*20 = 240.

The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.

20 is.

20

It is: 20

20

20, although if you reduced 15/20 to 3/4, the common denominator would be 4.

The lowest common denominator or least common multiple of 7 and 20 is 140.

60

There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

20

The answer is 220

40

40

40

20

140