Question

o find the LCM Z Hoff 12 15 21
prime facton Sation method​

Answer 1

Answer:

420 is the correct answer

Answer 2

Question: find the L.C.M and H.C.F of 12 , 15 and 21 by Prime factorization method.

Given:

☛ numbers are 12 , 15 and 21

To Find:

☛ H.C.F and L.C.F

Solution:

☛ 12 = 2² × 3

☛ 15 = 3 × 5

☛ 21 = 3 × 7

☛ H.C.F = common terms with lowest power

➜ H.C.F = 3¹

➜ H.C.F = 3

☛ L.C.M = prime factors with highest power

➜ L.C.M = 3 × 7 × 5 × 2²

➜ L.C.M = 15 × 28

➜ L.C.M = 420

Hence, L.C.M and H.C.F of these numbers are 420 and 3 respectively.