LCM of 21, 36 and 67
16884 is the LCM of 21, 36 and 67. 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, 36 and 67, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 21, 36 and 67?
lcm (21 36 67) = (?)
21 => 3 x 7
36 => 2 x 2 x 3 x 3
67 => 67
= 3 x 7 x 2 x 2 x 3 x 67
= 16884
lcm (21, 36 and 67) = 16884
The LCM of 21, 36 and 67 is 16884
where,
21 is a positive integer,
36 is a positive integer,
16884 is the LCM of 21, 36 and 67,
{3} in {3 x 7, 2 x 2 x 3 x 3, 67} is the most repeated factors of 21, 36 and 67,
{7, 2, 2, 3, 67} in {3 x 7, 2 x 2 x 3 x 3, 67} are the the other remaining factors of 21, 36 and 67.
Use in Mathematics: LCM of 21, 36 and 67
The below are some of the mathematical applications where lcm of 21, 36 and 67 can be used:
- to find the least number which is exactly divisible by 21, 36 and 67.
- to find the common denominators for the fractions having 21, 36 and 67 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 21, 36 and 67 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 36 seconds and C tolls at 67 seconds repeatedly. The answer is that all bells A, B and C toll together at 16884 seconds for the first time, at 33768 seconds for the second time, at 50652 seconds for the third time and so on.
Important Notes: 21, 36 and 67 lcm
The below are the important notes to be remembered while solving the lcm of 21, 36 and 67:
- The repeated and non-repeated prime factors of 21, 36 and 67 should be multiplied to find the least common multiple of 21, 36 and 67, when solving lcm by using prime factors method.
- The results of lcm of 21, 36 and 67 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, 36 and 67?
The below solved example with step by step work shows how to find what is the lcm of 21, 36 and 67 by using either prime factors method and special division method.
Solved example using prime factors method:
What is LCM of 21, 36 and 67?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 21
B = 36
C = 67
What to be found:
Find lcm of 21, 36 and 67
step 2 Find the prime factors of 21, 36 and 67:
Prime factors of 21 = 3 x 7
Prime factors of 36 = 2 x 2 x 3 x 3
Prime factors of 67 = 67
step 3 Identify the repeated and non-repeated prime factors of 21, 36 and 67:
{3} is the most repeated factor and {7, 2, 2, 3, 67} are the non-repeated factors of 21, 36 and 67.
step 4 Find the product of repeated and non-repeated prime factors of 21, 36 and 67:
= 3 x 7 x 2 x 2 x 3 x 67
= 16884
LCM(21, 36 and 67) = 16884
Hence,
The Least Common Multiple of 21, 36 and 67 is 16884
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 21, 36 and 67.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 21, 36 and 67
What to be found:
lcm (21, 36, 67) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
21, 36 and 67
step 3 Choose the divisor which divides each or most of the given integers (21, 36 and 67), 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, 36 and 67 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 2 | 21 | 36 | 67 |
| 2 | 21 | 18 | 67 |
| 3 | 21 | 9 | 67 |
| 3 | 7 | 3 | 67 |
| 7 | 7 | 1 | 67 |
| 67 | 1 | 1 | 67 |
| 1 | 1 | 1 |
step 4 Multiply the divisors to find the lcm of 21, 36 and 67:
= 2 x 2 x 3 x 3 x 7 x 67
= 16884
LCM(21, 36, 67) = 16884
The LCM of three numbers 21, 36 and 67 is 16884