Since 21 is divisible by 3, the least common denominator of 3 and 21 is 21.
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LCD(9, 21) = 63
The least common denominator (LCD) is 1.
LCD(49, 21) = 147
LCD(7, 5, 10) = 10
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.