We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
79
3
avatar

so in https://web2.0calc.com/questions/let-m-be-the-least-common-multiple-of-1-2-3-20-how_1 why do you only multiply the red numbers?

what do the red numbers mean?

 

thx

 Jul 27, 2019
edited by Melody  Jul 28, 2019
edited by Melody  Jul 28, 2019
 #1
avatar+893 
+2

The least common multiple includes the numbers with the most factors of 2, 3, 5, 7, 11, 13, and so on. The red numbers are just the numbers with the most factors of a specific prime. In other words, if you wanted to find the lcm of 1,2,3, and 4, then you would prime factor each number:

 

2=2

3=3

4=2^2

 

There is a number with 2 2s in its prime factorization, so 2^2 x 3 is our lcm.

 

Same with all the numbers from 1-20. Find the prime factors of each number and then find the number with the most 2s, 3s, and so on (I'm just listing the primes).

 Jul 27, 2019
 #2
avatar
0

so once we prime factorize wt do we do 4 lcm

Guest Jul 27, 2019
 #3
avatar+103678 
0

PLEASE CONTINUE THIS ON THE ORIGINAL THREAD.

 

(I HAVE OPENED IT)

 Jul 28, 2019

39 Online Users

avatar
avatar
avatar
avatar