What is the lcm of 3,9, and 15? 
       
      
                
     
    
    
    
    2  answers:
            
              
The LCM of any set of numbers that has a prime or a number of primes in common.  The way to find it is to factor the given number down to it's primes.
3: 3 
9: 3  * 3
15: 3  * 5
The number which has been bolded is the LCM in this case 3 <<<< Answer 
This is not a particularly good question to learn what it might be Try these 3 numbers.
42: 2 *3 * 7 
84: 2 * 2  * 3 * 7 
210: 2 *5 * 3 * 7 
The LCM for this bunch is 2 * 3 * 7 = 42
 
                                
             
                    
              
The least common multiple that is common in all numbers but is the lowest is 3 and it's the only number that all numbers listed can be divided easily by.
Hope this helps!
 
                                
             
         	
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