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Date: 09 May 2016   Posted By: shilpamary     Group: Education    Category: School Homework Help   

Problem solving is an activity for students in their curriculum. It involves more steps sometimes it leads to obstacles where they find it difficult to understand the concept of the problem. They should struggle with their problems to find out the solution…

My son is going to attend mathematical exam by next week, usually mathematical problems doesn't cover the question paper without LCM. It involves long process in solving, I have checked in https://www.shorttutorials.com/how-to-calculate-lcm/index.html website about how to calculate LCM for two numbers...

Can anyone send me the solution in calculating LCM for more than two numbers...


Wants to know a short circuit method for problem solving without using the LCM mode to help out school going kids. here are few tips from our experts.


Author: Purna Prasad Sharma    09 May 2016      Member Level: Silver     Points : 3  (Rs 3)    Voting Score: 0

Suppose we have to find LCM of 15,36 & 42

The common factor of  15 , 36 & 42  is 3,so after dividing by 3,the number are reduced to 5 ,12 & 14


Again from these three numbers 5 ,12 & 14.Only two numbers have factor and the two numbers are 12 & 14 .And their's common factor is 2,after dividing they reduced to 6 and 7.

Now after factorization,the reduced numbers remained 5,6 & 7 and the common factors are 3 & 2

Therefore multiply all these numbers
5 x 6 x 7 x 3 x 2 = 1260

The LCM is  1260.



Author: ar    09 May 2016      Member Level: Gold     Points : 2  (Rs 2)    Voting Score: 0

LCM for more than two numbers.
Write all numbers in a row separated by commas.
Start with the smallest number which divides at least two of these numbers.
If the number is a factor then write then divide the numbers separately and write their remainders in the row below them.
Continue the above step till common factors are not possible for at least two numbers.
Finally,multiply all the factors and also the remainders in the last row.
This will give us the LCM of these given numbers.


Author: Teja    12 May 2016      Member Level: Silver     Points : 3  (Rs 3)    Voting Score: 0

How to Calculate LCM:

LCM means Least Common Multiple. For example,
Take a Number "6"
What are the common Multiples of 6 : 6,12,18,24,30,36,42,48...............................................till infinite

Method to Solve:
Find the LCM of 20,42 and 36 ?
Ans: Write Factors of all the numbers first.
20 = 2*2*5 = 2^2 * 5
42 = 2*7*3
36 = 2*2*3*3 = 2^2 * 3^3

What you have to do now is take all the numbers that appears maximum even for 1 time in the above sequences. To find LCM, you are required to take the following numbers into consideration
2^2,5,7,3^3 ...So multiply them and the result is the answer of it.
Answer ==== 4*5*7*9 = 1260





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