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Q: When is the LCM of a pair of numbers one of the numbers?

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Only if one of the numbers is a multiple of the other.

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

The LCM for any pair of natural numbers can be as big as their product.

This doesn't work. The LCM of a pair of numbers has to be equal to or larger than the largest number of the pair. If one of the numbers is 60, the other is 120. 60 and 120 have a GCF of 60, not an LCM.

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

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Only if one of the numbers is a multiple of the other.

If that number is a multiple of the other one.

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

The LCM for any pair of natural numbers can be as big as their product.

Yes. The LCM of 9 and 3 is 9.

This doesn't work. The LCM of a pair of numbers has to be equal to or larger than the largest number of the pair. If one of the numbers is 60, the other is 120. 60 and 120 have a GCF of 60, not an LCM.

4 and 6 are one pair of numbers with an LCM of 12.

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

No.

1 and 5 have an LCM of 5.

The LCM is: 35

The product of the GCF and LCM of a pair of numbers is equal to the product of the numbers.

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