LCM of 23, 5 and 7
805 is the LCM of 23, 5 and 7. 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 23, 5 and 7, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 23, 5 and 7?
lcm (23 5 7) = (?)
23 => 23
5 => 5
7 => 7
= 23 x 5 x 7
= 805
lcm (23, 5 and 7) = 805
The LCM of 23, 5 and 7 is 805
where,
23 is a positive integer,
5 is a positive integer,
805 is the LCM of 23, 5 and 7,
in {23, 5, 7} there is no repeated factors of 23, 5 and 7,
{23, 5, 7} in {23, 5, 7} are the the other remaining factors of 23, 5 and 7.
Use in Mathematics: LCM of 23, 5 and 7
The below are some of the mathematical applications where lcm of 23, 5 and 7 can be used:
- to find the least number which is exactly divisible by 23, 5 and 7.
- to find the common denominators for the fractions having 23, 5 and 7 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 23, 5 and 7 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 23 seconds, B tolls at 5 seconds and C tolls at 7 seconds repeatedly. The answer is that all bells A, B and C toll together at 805 seconds for the first time, at 1610 seconds for the second time, at 2415 seconds for the third time and so on.
Important Notes: 23, 5 and 7 lcm
The below are the important notes to be remembered while solving the lcm of 23, 5 and 7:
- The repeated and non-repeated prime factors of 23, 5 and 7 should be multiplied to find the least common multiple of 23, 5 and 7, when solving lcm by using prime factors method.
- The results of lcm of 23, 5 and 7 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 23, 5 and 7?
The below solved example with step by step work shows how to find what is the lcm of 23, 5 and 7 by using either prime factors method and special division method.
Solved example using prime factors method:
What is LCM of 23, 5 and 7?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 23
B = 5
C = 7
What to be found:
Find lcm of 23, 5 and 7
step 2 Find the prime factors of 23, 5 and 7:
Prime factors of 23 = 23
Prime factors of 5 = 5
Prime factors of 7 = 7
step 3Identify the repeated and non-repeated prime factors of 23, 5 and 7:
Since there is no common factors between 23, 5 and 7, multiplying the given numbers directly provides the LCM of
23, 5 and 7.
= 23 x 5 x 7
= 805
LCM(23, 5 and 7) = 805
Hence,
The Least Common Multiple of 23, 5 and 7 is 805
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 23, 5 and 7.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 23, 5 and 7
What to be found:
lcm (23, 5, 7) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
23, 5 and 7
step 3 Choose the divisor which divides each or most of the given integers (23, 5 and 7), 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 23, 5 and 7 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 5 | 23 | 5 | 7 |
| 7 | 23 | 1 | 7 |
| 23 | 23 | 1 | 1 |
| 1 | 1 | 1 |
step 4 Multiply the divisors to find the lcm of 23, 5 and 7:
= 5 x 7 x 23
= 805
LCM(23, 5, 7) = 805
The LCM of three numbers 23, 5 and 7 is 805