LCM of 31 and 39
1209 is the LCM of 31 and 39. 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 31 and 39, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 31 and 39?
lcm (31 39) = (?)
31 => 31
39 => 3 x 13
= 31 x 3 x 13
= 1209
lcm (31 and 39) = 1209
1209 is the LCM of 31 and 39.
where,
31 is a positive integer,
39 is a positive integer,
1209 is the LCM of 31 and 39,
There is no common factors of 31 and 39 in {31, 3 x 13},
{31 x 3 x 13} in {31, 3 x 13} are the uncommon factors of 31 and 39.
Use in Mathematics: LCM of 31 and 39
The below are some of the mathematical applications where lcm of 31 and 39 can be used:
- to find the least number which is exactly divisible by 31 and 39.
- to find the common denominator for two fractions having 31 and 39 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 31 and 39 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 31 seconds and bell B tolls at 39 seconds repeatedly. The answer is that all bells A and B toll together at 1209 seconds for the first time, at 2418 seconds for the second time, at 3627 seconds for the third time and so on.
Important Notes: 31 and 39 lcm
The below are the important notes to be remembered while solving the lcm of 31 and 39:
- The common prime factors and the remaining prime factors of 31 and 39 should be multiplied to find the least common multiple of 31 and 39, when solving lcm by using prime factors method.
- The results of lcm of 31 and 39, and the lcm of 39 and 31 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 31 and 39?
The below solved example with step by step work shows how to find what is the lcm of 31 and 39 by using prime factors method and division method.
Solved example using prime factors method:
What is the LCM of 31 and 39?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 31
B = 39
What to be found:
find the lcm of 31 and 39
step 2 Find the prime factors of 31 and 39:
Prime factors of 31 = 31
Prime factors of 39 = 3 x 13
step 3Identify the repeated and non-repeated prime factors of 31 and 39:
Since there is no common factors between 31 and 39, multiplying the given numbers directly provides the LCM of
31 and 39.
= 31 x 39
= 1209
lcm(31 and 39) = 1209
Hence,
lcm of 31 and 39 is 1209
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 31 and 39.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 31 and 39
What to be found:
lcm (31, 39) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
31 and 39
step 3 Choose the divisor which divides each or most of the given integers (31 and 39), 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 31 and 39 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 3 | 31 | 39 |
| 13 | 31 | 13 |
| 31 | 31 | 1 |
| 1 | 1 |
step 4 Multiply the divisors to find the lcm of 31 and 39:
= 3 x 13 x 31
= 1209
LCM(31, 39) = 1209
The LCM of two numbers 31 and 39 is 1209