Question

LCM of 9 and 45 is
A)9
B)3
C)45
D)405​

Answer 1

the LCM of 9 and 45 is 45 .

Answer 2

9 = 32

45 = 32 • 5

81 = 34

Build a prime factors table

Number of times each prime factor

appears in the factorization of :

Prime

Factor Number

9 Number

45 Number

81 L.C.M

(max)

3 2 2 4 4

5 0 1 0 1

LCM = 34 • 5

Least Common Multiple is :

405