4, 8, 12, 16, 20
10, 20
The LCM is 20.
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7 x 8 = 56
Multiplying the highest prime factors it is: 72
The lowest common multiple is 144. There's no such thing as the highest commonmultiple. If anybody ever brings you a number and tells you it's the highest commonmultiple of 36 and 48, just add 144 to his number, and show him that you've createda common multiple that's even greater than his.By the way, if you were actually asking for the highest common factor of 36 and 48,then that would be 12 .
It's a method that lets you quickly find both the greatest common factor and the least common multiple of two numbers. I am not sure how well it works for more than two numbers at a time. If you search online for "ladder method", you'll quickly find several videos that show you how to do it.
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