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Q: What is the LCM of each what pairs of numbers 2 and 3 and 5 and 7 and 11 and 19?

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1 and 11

4 and 9 11 and 12

Any pair of prime numbers. 5 and 7 11 and 13

The LCM is: 110

Pair 1: (3 and 5) LCM = 15 Pair 2: (3 and 7) LCM = 21 Pair 3: (13 and 19) LCM = 247

The LCM of any two consecutive numbers greater than zero is the two numbers multiplied together. eg. the LCM of 10 and 11 is: 10*11=110

1 and 11

The LCM of two numbers is the product of the numbers if one of the numbers is a prime. Since 11 is a prime, the LCM of 10 and 11 is 110 (10 x 11). If neither number had been a prime, the LCM would have been the product of all the prime factors of the numbers to their greatest power.

You need at least two numbers to find an LCM.

33 and 77 have a GCF of 11 and an LCM of 231.

The above is completely true. However, factoring problems in textbooks are usually arranged to have one correct answer. The thing these sorts of problems want you to remember is that the product of the GCF and the LCM of a pair of numbers is the same as the product of the numbers. If you are given the GCF and LCM of a pair of numbers, multiply them together. The numbers will be another factor pair of that product.

Since both 11 and 7 are prime numbers the LCM is 77

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