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The answer is 63.

LCM of 63 and 66 is 1386.

GCF of 63 and 66 is 3. Given one number A, the formula for finding B, the unknown number, is : (LCM/A) x GCF = B (1386/66) x 3 = 21 x 3 = 63

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Q: The LCM of two numbers is 1386 and the GCF is 3 so if one number is 66 what is the other?

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The product of the original numbers is equal to the product of the GCF and LCM. Divide the product of the LCM and GCF by the one number. The answer will be the other.

The other number is: 12

The GCF of any set of numbers implies that all numbers in the set are multiples of the GCF. The multiples of 17 are 17,34,51 etc. If the greater number is 51 (which is an odd number) then the only solution for the other number (which is even and less than 51) is 34.

Yes, if one of the numbers is a factor of the other.

Given a pair of numbers, if the lesser of the two is the GCF, the greater of the two is the LCM. This happens when one of the numbers is a factor of the other.

Related questions

The GCF is the smaller number.

When the first number is a factor of the other, the first number is the GCF.

The GCF of 1 and any other number is 1.

GCF of 1386 and 2056 is 2

The GCF is 42.

In that case, the smaller number is the GCF of the pair.

If one of the numbers is a multiple of the other, the smaller number is the GCF. If the two numbers are prime numbers, the GCF is 1. If the numbers are consecutive, the GCF is 1. If the numbers are consecutive even numbers, the GCF is 2.

The GCF is the factor, the LCM is the other one.

The product of the original numbers is equal to the product of the GCF and LCM. Divide the product of the LCM and GCF by the one number. The answer will be the other.

The other number is: 12

You need at least two numbers to find a GCF, but the GCF of 1 and any other number will be one.

12 16 = GCF

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