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This will be difficult to answer accurately as you haven't given us the given number but as a general rule, list the given number with two of its factors. If the given number was 15, (15, 5) and (15, 3) both have an LCM of 15.

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11y ago
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11y ago

That's not necessarily enough information. The original numbers will be another factor pair of the product of the GCF and LCM. If that number has more than two factor pairs, more information will be required.

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8y ago

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6, the GCF

Suppose you want to write the fraction 30/42 in its simplest form. Dividing both of those numbers by their GCF will accomplish that, giving you 5/7

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11y ago

The product of the LCM and GCF of two numbers is equal to the product of the original two numbers. The two numbers will be another factor pair of that product.

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Q: How do you find and use the greatest common factor of two whole numbers?
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Related questions

Why do you have greatest common factor and not least common factor?

The least (meaning lowest) common factor of any set of whole numbers is always 1. The greatest common factor of any set of whole numbers will depend on the factors of the individual whole numbers in the set.


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The greatest whole number that is a factor of two or more nonzero whole numbers?

That's the greatest common factor, or GCF.


What is the greatest whole number that is a factor of two or more nonzero whole numbers?

That's the greatest common factor, or GCF.


What is greatest common factor of 252?

This cannot be properly answered. You must have at least two whole numbers to determine a greatest common factor.


When is 1 the greatest common factor of 2 numbers?

1 is a factor of every whole number, and the gcf of two numbers can be 1 if there is no larger factor common to both numbers.


How does the greatest common factor relate two or not whole numbers?

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. The largest of these is known as the greatest common factor, or GCF.