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Q: How do you find the LCM and GCF of two prime numbers?

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

Their product.

Draw the prime factorization table and put both the numbers on it. Find common prime factors and divide both of them writing the products down. Do this until the quotients are either 1 or any prime number. Write down all the factors used and it will be the prime factorization. Multiply them and you will find the LCM of the numbers. Here, 18,21 6,7...................(/3) Prime factorization=6*7*3 LCM=42*3=126

true 2x3=6 LCM (2,3)=6 3x5=15 LCM (3,5)=15 2x5=10 LCM (2,5)=10

When adding fractions, you want to make sure that the denominators are the same. It's the same process as the LCM.

Related questions

Prime numbers help you to find the LCM and the GCF.

You can find the GCF and/or the LCM of a set of numbers by comparing the prime factorizations of the individual members of the set.

Dividing them by prime numbers

GCF and LCM are similar because you need to find the prime factorizations of the two numbers in both cases to get the result.

You need at least two numbers to find either a GCF or an LCM.

To find the LCM and GCF of numbers at least two or more numbers are neeeded.

By finding their common prime numbers.

Any prime number with its multiple.

No. You can only find the LCM of at least two numbers, prime or otherwise. The LCM of any two prime numbers is their product.

The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.

6 and 8

The LCM of two numbers multiplied by their GCF will equal the product of the original numbers. If you know the LCM, divide it into the product. The result will be the GCF.

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