84 and 189 LCM
LCM of 84 and 189 is equal to 756. The comprehensive work provides more insight of how to find what is the lcm of 84 and 189 by using prime factors and special division methods, and the example use case of mathematics and real world problems.
what is the lcm of 84 and 189?
lcm (84 189) = (?)
84 => 2 x 2 x 3 x 7
189 => 3 x 3 x 3 x 7
= 3 x 7 x 2 x 2 x 3 x 3
= 756
lcm (84 and 189) = 756
756 is the lcm of 84 and 189.
where,
84 is a positive integer,
189 is a positive integer,
756 is the lcm of 84 and 189,
{3 x 7} in {2 x 2 x 3 x 7, 3 x 3 x 3 x 7} are the common factors of 84 and 189,
{2 x 2 x 3 x 3} in {2 x 2 x 3 x 7, 3 x 3 x 3 x 7} are the uncommon factors of 84 and 189.
Use in Mathematics: LCM of 84 and 189
The below are some of the mathematical applications where lcm of 84 and 189 can be used:
- to find the least number which is exactly divisible by 84 and 189.
- to find the common denominator for two fractions having 84 and 189 as denominators in the unlike fractions addition or subtraction.
In the context of lcm real world problems, the lcm of 84 and 189 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 189 seconds repeatedly. The answer is that all bells A and B toll together at 756 seconds for the first time, at 1512 seconds for the second time, at 2268 seconds for the third time and so on.
Important Notes: 84 and 189 lcm
The below are the important notes to be remembered while solving the lcm of 84 and 189:
- The common prime factors and the remaining prime factors of 84 and 189 should be multiplied to find the least common multiple of 84 and 189, when solving lcm by using prime factors method.
- The results of lcm of 84 and 189, and the lcm of 189 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 189?
The below solved example with step by step work shows how to find what is the lcm of 84 and 189 by using prime factors method and division method.
Solved example using prime factors method:
What is the LCM of 84 and 189?
step 1
Address the input parameters, values and observe what to be found:
Input parameters and values:
A = 84
B = 189
What to be found:
find the lcm of 84 and 189
step 2 Find the prime factors of 84 and 189:
Prime factors of 84 = 2 x 2 x 3 x 7
Prime factors of 189 = 3 x 3 x 3 x 7
step 3 Identify the repeated and non-repeated prime factors of 84 and 189:
{3, 7} are the most repeated factors and {2 x 2 x 3 x 3} are the non-repeated factors of 84 and 189.
step 4 Find the product of repeated and non-repeated prime factors of 84 and 189:
= 3 x 7 x 2 x 2 x 3 x 3
= 756
lcm(84 and 189) = 756
Hence,
lcm of 84 and 189 is 756
This special division method is the easiest way to understand the entire calculation of what is the lcm of 84 and 189.
step 1 Address the input parameters, values and observe what to be found:
Input parameters and values:
Integers: 84 and 189
What to be found:
lcm (84, 189) = ?
step 2 Arrange the given integers in the horizontal form with space or comma separated format:
84 and 189
step 3 Choose the divisor which divides each or most of the given integers (84 and 189), 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 189 is not divisible by the selected divisor; repeat the same process until all the integers are brought to 1 as like below:
| 2 | 84 | 189 |
| 2 | 42 | 189 |
| 3 | 21 | 189 |
| 3 | 7 | 63 |
| 3 | 7 | 21 |
| 7 | 7 | 7 |
| 1 | 1 |
step 4 Multiply the divisors to find the lcm of 84 and 189:
= 2 x 2 x 3 x 3 x 3 x 7
= 756
LCM(84, 189) = 756
The least common multiple for two numbers 84 and 189 is 756