The least common divisor is always the number "1."
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The biggest common divisor of 9 and 15 is 3. To find the least common multiples of 9 an 15 you should multiply these numbers and divide the result by their biggest common divisor. 9x15/3=45
You need at least two numbers to find a GCF.
It is not possible to give a sensible answer to this question. The greatest common divisor (GCD) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
The Greatest Common Divisor of 204, 510 is 102.
A single number cannot have a greatest common divisor because "common" refers to factors that two or more numbers have in common. You have only one.