33 and 77 have a GCF of 11 and an LCM of 231.
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You need at least two numbers to find an LCM. If that's 7, 11 and 21, the LCM is 231.
The LCM of 11 and 21 is 231
110
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.
To find numbers that multiply to give you 231, you can factorize 231 and look for its prime factors. 231 = 3 * 7 * 11 So, the numbers you can multiply to get 231 are 3, 7, and 11.
Since 18 and 47 have no common factors besides 1, simply multiply these two numbers. So, the LCM is 846.
The Least Common Multiple (LCM) for 11 3 7 is 231.
It is: 3*7*11 = 231
The least common multiple of 11, 21 and 77 is 231.
3 * 7 * 11 = 231