Question

Fill in the blanks.
(a) Prime factorisation of 15 :
Prime factorisation of 90:
LCM of 15 and 90 =
b) Prime factorisation of 18 :
Prime factorisation of 24:
LCM of 18 and 24 =
(c) Prime factorisation of 25:
Prime factorisation of 15 :
LCM of 25 and 15 =
(d) Prime factorisation of 27 :
Prime factorisation of 42 :
LCM of 27 and 42 =
notorisation method, find the LCM.​

Answer 1

Explanation:

• prime factorisation of 15 = 3×5

prime factorisation of 90 = 3×3×2×5

LCM = 90

• prime factorisation of 18 = 3×3×2

prime factorisation of 24 = 3×2×2×2

LCM = 72

• prime factorisation of 25 = 5×5

prime factorisation of 15 = 5×3

LCM = 75

• prime factorisation of 27 = 3×3×3

prime factorisation of 42 = 3×2×7

LCM = 378