LCM of 20 and 24 is 120. The Least Common multiple or Lowest common multiple simply known as LCM is the smallest or the least positive integer that is divisible by the given set of numbers. In the given set of numbers 20 and 24, 120 is the first (least or smallest) number that is common in the set of multiples of 20 and 24. Even 240 is a common multiple of 20 and 24, however it is not the least or the smallest common multiple. The LCM is also known as LCD, Least Common Divisor for 20 and 24 is 120. You can read more on LCM for further details.
What is LCM of 20 and 24
The Least Common Multiple or Lowest Common Multiple of 20 and 24 is 120.
How to Find LCM of 20 and 24?
LCM of 20 and 24 can be determined using three methods:
- Prime Factorisation
- Division method
- Listing the multiples
LCM of 20 and 24 Using Prime Factorisation Method
In the Prime Factorisation method, the numbers can be expressed as the product of prime numbers. Here, 20 and 24 can be expressed as;
20 = 2 x 2 x 5
24 = 2 x 2 x 2 x 3
LCM (20, 24) = 2 x 2 x 2 x 3 x 5 = 120
LCM of 20 and 24 Using Division Method
In the Division Method, the given set of numbers are written in the same row separated by a comma. These numbers are divided with the smallest number that divides all, until no further division is possible or only when prime numbers are left.
|
2 |
20 |
24 |
|
2 |
10 |
12 |
|
3 |
5 |
6 |
|
2 |
5 |
2 |
|
5 |
5 |
1 |
|
x |
1 |
1 |
LCM (20, 24) = 2 x 2 x 2 x 3 x 5 = 120
LCM of 20 and 24 Using Listing the Multiples
By listing all the multiples of given numbers, we can identify the first/smallest/least common multiple, which is the LCM. Below is the list of multiples for 20 and 24
|
Multiples of 20 |
Multiples of 24 |
|
20 |
24 |
|
40 |
48 |
|
60 |
72 |
|
80 |
96 |
|
100 |
120 |
|
120 |
144 |
|
140 |
168 |
LCM (20, 24) = 120
Related Articles
Video Lesson on Applications of LCM
Solved Examples
What is the smallest number that is divisible by both 20 and 24?
Answer: 120 is the smallest number that is divisible by both 20 and 24.
What is the LCM for 2, 20 and 24?
Answer: LCM for 2, 20 and 24 is 120.
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