LCM of 84 and 257
21588 is the LCM of 84 and 257. 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 84 and 257, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 84 and 257?
lcm (84 257) = (?)
84 => 2 x 2 x 3 x 7
257 => 257
= 2 x 2 x 3 x 7 x 257
= 21588
lcm (84 and 257) = 21588
21588 is the LCM of 84 and 257.
where,
84 is a positive integer,
257 is a positive integer,
21588 is the LCM of 84 and 257,
There is no common factors of 84 and 257 in {2 x 2 x 3 x 7, 257},
{2 x 2 x 3 x 7 x 257} in {2 x 2 x 3 x 7, 257} are the uncommon factors of 84 and 257.
Use in Mathematics: LCM of 84 and 257
The below are some of the mathematical applications where lcm of 84 and 257 can be used:
- to find the least number which is exactly divisible by 84 and 257.
- to find the common denominator for two fractions having 84 and 257 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 84 and 257 helps to find the exact time when two similar and recurring events 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 the bells A and B all toll together, if bell A tolls at 84 seconds and bell B tolls at 257 seconds repeatedly. The answer is that all bells A and B toll together at 21588 seconds for the first time, at 43176 seconds for the second time, at 64764 seconds for the third time and so on.
Important Notes: 84 and 257 lcm
The below are the important notes to be remembered while solving the lcm of 84 and 257:
- The common prime factors and the remaining prime factors of 84 and 257 should be multiplied to find the least common multiple of 84 and 257, when solving lcm by using prime factors method.
- The results of lcm of 84 and 257, and the lcm of 257 and 84 are identical, it means the order of given numbers in the lcm calculation doesn't affect the results.
How-to: What is the LCM of 84 and 257?
The below solved example with step by step work shows how to find what is the lcm of 84 and 257 by using prime factors method and division method.
Solved example using prime factors method:
What is the LCM of 84 and 257?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 84
B = 257
What to be found:
find the lcm of 84 and 257
step 2 Find the prime factors of 84 and 257:
Prime factors of 84 = 2 x 2 x 3 x 7
Prime factors of 257 = 257
step 3Identify the repeated and non-repeated prime factors of 84 and 257:
Since there is no common factors between 84 and 257, multiplying the given numbers directly provides the LCM of
84 and 257.
= 84 x 257
= 21588
lcm(84 and 257) = 21588
Hence,
lcm of 84 and 257 is 21588
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 84 and 257.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 84 and 257
What to be found:
lcm (84, 257) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
84 and 257
step 3 Choose the divisor which divides each or most of the given integers (84 and 257), 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 84 and 257 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 2 | 84 | 257 |
| 2 | 42 | 257 |
| 3 | 21 | 257 |
| 7 | 7 | 257 |
| 257 | 1 | 257 |
| 1 | 1 |
step 4 Multiply the divisors to find the lcm of 84 and 257:
= 2 x 2 x 3 x 7 x 257
= 21588
LCM(84, 257) = 21588
The LCM of two numbers 84 and 257 is 21588