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Question 507133: The LCM of numbers 15,70,105 is:can you give this anwer?
Answer by Edwin McCravy(20077)   (Show Source):
You can put this solution on YOUR website! 15,70,105
Break them down into primes, like this (you can use factor trees).
15 = 3*5, 70 = 2*5*7, 105 = 3*5*7
Now list like factors like this, so that like factor line up
vertically in columns:
15 = 3*5
70 = 2 *5*7
105 = 3*5*7
Then draw a line underneath:
15 = 3*5
70 = 2 *5*7
105 = 3*5*7
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Now under that line bring down the factor of each column:
15 = 3*5
70 = 2 *5*7
105 = 3*5*7
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2*3*5*7
And multiply those together and get 210. That's the LCM
Edwin
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