Find the lcm by prime factorization method of 21, 28
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Step-by-step explanation:
Alternatively, the lcm of 21 and 28 can be found using the prime factorization of 21 and 28:
The prime factorization of 21 is: 3 x 7
The prime factorization of 28 is: 2 x 2 x 7
Eliminate the duplicate factors of the two lists, then multiply them once with the remaining factors of the lists to get lcm(21,21) = 84
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Answer:
LCM=84
Step-by-step explanation:
21= 7×3
28=7×4
NOW 7 IS COMMON BETWEEN 21 AND 28 SO WHILE CALCULATING LCM WE WILL TAKE 7 ONLY ONCE.
LCM = 7×4×3 =84
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