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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