LCM of 90 and 142
6390 is the LCM of 90 and 142. 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 90 and 142, provided along with the use cases of mathematics and real-world problems.
what is the lcm of 90 and 142?
lcm (90 142) = (?)
90 => 2 x 3 x 3 x 5
142 => 2 x 71
= 2 x 3 x 3 x 5 x 71
= 6390
lcm (90 and 142) = 6390
6390 is the LCM of 90 and 142.
where,
90 is a positive integer,
142 is a positive integer,
6390 is the LCM of 90 and 142,
{2} in {2 x 3 x 3 x 5, 2 x 71} is the common factors of 90 and 142,
{3 x 3 x 5 x 71} in {2 x 3 x 3 x 5, 2 x 71} are the uncommon factors of 90 and 142.
Use in Mathematics: LCM of 90 and 142
The below are some of the mathematical applications where lcm of 90 and 142 can be used:
- to find the least number which is exactly divisible by 90 and 142.
- to find the common denominator for two fractions having 90 and 142 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 90 and 142 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 90 seconds and bell B tolls at 142 seconds repeatedly. The answer is that all bells A and B toll together at 6390 seconds for the first time, at 12780 seconds for the second time, at 19170 seconds for the third time and so on.
Important Notes: 90 and 142 lcm
The below are the important notes to be remembered while solving the lcm of 90 and 142:
- The common prime factors and the remaining prime factors of 90 and 142 should be multiplied to find the least common multiple of 90 and 142, when solving lcm by using prime factors method.
- The results of lcm of 90 and 142, and the lcm of 142 and 90 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 90 and 142?
The below solved example with step by step work shows how to find what is the lcm of 90 and 142 by using prime factors method and division method.
Solved example using prime factors method:
What is the LCM of 90 and 142?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 90
B = 142
What to be found:
find the lcm of 90 and 142
step 2 Find the prime factors of 90 and 142:
Prime factors of 90 = 2 x 3 x 3 x 5
Prime factors of 142 = 2 x 71
step 3 Identify the repeated and non-repeated prime factors of 90 and 142:
{2} is the most repeated factor and {3 x 3 x 5 x 71} are the non-repeated factors of 90 and 142.
step 4 Find the product of repeated and non-repeated prime factors of 90 and 142:
= 2 x 3 x 3 x 5 x 71
= 6390
lcm(90 and 142) = 6390
Hence,
lcm of 90 and 142 is 6390
This special division method is one of the easiest ways to understand the entire calculation to find the LCM of 90 and 142.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 90 and 142
What to be found:
lcm (90, 142) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
90 and 142
step 3 Choose the divisor which divides each or most of the given integers (90 and 142), 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 90 and 142 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 2 | 90 | 142 |
| 3 | 45 | 71 |
| 3 | 15 | 71 |
| 5 | 5 | 71 |
| 71 | 1 | 71 |
| 1 | 1 |
step 4 Multiply the divisors to find the lcm of 90 and 142:
= 2 x 3 x 3 x 5 x 71
= 6390
LCM(90, 142) = 6390
The LCM of two numbers 90 and 142 is 6390