LCM of 128 and 255
32640 is the LCM of 128 and 255. 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 128 and 255, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 128 and 255?
lcm (128 255) = (?)
128 => 2 x 2 x 2 x 2 x 2 x 2 x 2
255 => 3 x 5 x 17
= 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 5 x 17
= 32640
lcm (128 and 255) = 32640
32640 is the LCM of 128 and 255.
where,
128 is a positive integer,
255 is a positive integer,
32640 is the LCM of 128 and 255,
There is no common factors of 128 and 255 in {2 x 2 x 2 x 2 x 2 x 2 x 2, 3 x 5 x 17},
{2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 5 x 17} in {2 x 2 x 2 x 2 x 2 x 2 x 2, 3 x 5 x 17} are the uncommon factors of 128 and 255.
Use in Mathematics: LCM of 128 and 255
The below are some of the mathematical applications where lcm of 128 and 255 can be used:
- to find the least number which is exactly divisible by 128 and 255.
- to find the common denominator for two fractions having 128 and 255 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 128 and 255 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 128 seconds and bell B tolls at 255 seconds repeatedly. The answer is that all bells A and B toll together at 32640 seconds for the first time, at 65280 seconds for the second time, at 97920 seconds for the third time and so on.
Important Notes: 128 and 255 lcm
The below are the important notes to be remembered while solving the lcm of 128 and 255:
- The common prime factors and the remaining prime factors of 128 and 255 should be multiplied to find the least common multiple of 128 and 255, when solving lcm by using prime factors method.
- The results of lcm of 128 and 255, and the lcm of 255 and 128 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 128 and 255?
The below solved example with step by step work shows how to find what is the lcm of 128 and 255 by using prime factors method and division method.
Solved example using prime factors method:
What is the LCM of 128 and 255?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 128
B = 255
What to be found:
find the lcm of 128 and 255
step 2 Find the prime factors of 128 and 255:
Prime factors of 128 = 2 x 2 x 2 x 2 x 2 x 2 x 2
Prime factors of 255 = 3 x 5 x 17
step 3Identify the repeated and non-repeated prime factors of 128 and 255:
Since there is no common factors between 128 and 255, multiplying the given numbers directly provides the LCM of
128 and 255.
= 128 x 255
= 32640
lcm(128 and 255) = 32640
Hence,
lcm of 128 and 255 is 32640
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 128 and 255.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 128 and 255
What to be found:
lcm (128, 255) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
128 and 255
step 3 Choose the divisor which divides each or most of the given integers (128 and 255), 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 128 and 255 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 2 | 128 | 255 |
| 2 | 64 | 255 |
| 2 | 32 | 255 |
| 2 | 16 | 255 |
| 2 | 8 | 255 |
| 2 | 4 | 255 |
| 2 | 2 | 255 |
| 3 | 1 | 255 |
| 5 | 1 | 85 |
| 17 | 1 | 17 |
| 1 | 1 |
step 4 Multiply the divisors to find the lcm of 128 and 255:
= 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 5 x 17
= 32640
LCM(128, 255) = 32640
The LCM of two numbers 128 and 255 is 32640