Question

find the LCM and HCF of 12,15,21​

Answer 1

Step-by-step explanation:

Least Common Multiple is :

      420

Calculate Least Common Multiple for :

    12, 15 and 21

Factorize of the above numbers :

    12 = 22 • 3 

    15 = 3 • 5 

    21 = 3 • 7 

Build a prime factors table

    Number of times each prime factor

    appears in the factorization of : Prime 

 Factor  Number 

 12  Number 

 15  Number 

 21   L.C.M  

 (max) 22002311115010170011 LCM = 22 • 3 • 5 • 7

Least Common Multiple is :

420