LCM of 21, 50 and 79
82950 is the LCM of 21, 50 and 79. The step-by-step solution using prime factors and special division methods is one of the simple methods to easily understand how to find what is the LCM of 21, 50 and 79, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 21, 50 and 79?
lcm (21 50 79) = (?)
21 => 3 x 7
50 => 2 x 5 x 5
79 => 79
= 3 x 7 x 2 x 5 x 5 x 79
= 82950
lcm (21, 50 and 79) = 82950
The LCM of 21, 50 and 79 is 82950
where,
21 is a positive integer,
50 is a positive integer,
82950 is the LCM of 21, 50 and 79,
in {3 x 7, 2 x 5 x 5, 79} there is no repeated factors of 21, 50 and 79,
{3, 7, 2, 5, 5, 79} in {3 x 7, 2 x 5 x 5, 79} are the the other remaining factors of 21, 50 and 79.
Use in Mathematics: LCM of 21, 50 and 79
The below are some of the mathematical applications where lcm of 21, 50 and 79 can be used:
- to find the least number which is exactly divisible by 21, 50 and 79.
- to find the common denominators for the fractions having 21, 50 and 79 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 21, 50 and 79 helps to find the exact time when three similar and recurring with different time schedule happens together at the same time. For example, the real world problems involve lcm in situations to find at what time all the bells A, B and C toll together, if bell A tolls at 21 seconds, B tolls at 50 seconds and C tolls at 79 seconds repeatedly. The answer is that all bells A, B and C toll together at 82950 seconds for the first time, at 165900 seconds for the second time, at 248850 seconds for the third time and so on.
Important Notes: 21, 50 and 79 lcm
The below are the important notes to be remembered while solving the lcm of 21, 50 and 79:
- The repeated and non-repeated prime factors of 21, 50 and 79 should be multiplied to find the least common multiple of 21, 50 and 79, when solving lcm by using prime factors method.
- The results of lcm of 21, 50 and 79 is identical even if we change the order of given numbers in the lcm calculation, it means the order of given numbers in the lcm calculation doesn't affect the results.
How-to: What is LCM of 21, 50 and 79?
The below solved example with step by step work shows how to find what is the lcm of 21, 50 and 79 by using either prime factors method and special division method.
Solved example using prime factors method:
What is LCM of 21, 50 and 79?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 21
B = 50
C = 79
What to be found:
Find lcm of 21, 50 and 79
step 2 Find the prime factors of 21, 50 and 79:
Prime factors of 21 = 3 x 7
Prime factors of 50 = 2 x 5 x 5
Prime factors of 79 = 79
step 3Identify the repeated and non-repeated prime factors of 21, 50 and 79:
Since there is no common factors between 21, 50 and 79, multiplying the given numbers directly provides the LCM of
21, 50 and 79.
= 21 x 50 x 79
= 82950
LCM(21, 50 and 79) = 82950
Hence,
The Least Common Multiple of 21, 50 and 79 is 82950
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 21, 50 and 79.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 21, 50 and 79
What to be found:
lcm (21, 50, 79) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
21, 50 and 79
step 3 Choose the divisor which divides each or most of the given integers (21, 50 and 79), divide each integers separately and write down the quotient in the next line right under the respective integers. Bring down the integer to the next line if any integer in 21, 50 and 79 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 2 | 21 | 50 | 79 |
| 3 | 21 | 25 | 79 |
| 5 | 7 | 25 | 79 |
| 5 | 7 | 5 | 79 |
| 7 | 7 | 1 | 79 |
| 79 | 1 | 1 | 79 |
| 1 | 1 | 1 |
step 4 Multiply the divisors to find the lcm of 21, 50 and 79:
= 2 x 3 x 5 x 5 x 7 x 79
= 82950
LCM(21, 50, 79) = 82950
The LCM of three numbers 21, 50 and 79 is 82950