Question
The L.C.M. of 15, 30 is____________.
- 10
- 20
- 30
- 40
Hint:
LCM stands for least common multiple.
Multiple is the result of multiplying any number with other numbers like 1, 2, 3, 4, etc.
Example:
Multiple of 2 - 2, 4, 6, 8, 10, 12, and so on.
The least common multiple (LCM) of two or more given numbers is the smallest number that is a multiple of all the given numbers.
The correct answer is: 30
To find the LCM of 15 and 30 find the prime factors of each.
15 = 3 x 5
30 = 2 x 3 x 5
To find the LCM take out the common factors and multiply it with the remaining numbers.
LCM = 3 x 5 x 2
LCM = 30
The correct option is (c) 30
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