Question

Find the HCFand lcm of the following given pairs of numbers by prime factorisation (1)120,90

Answer 1

★ A n S w E r :-

i) 120,90

Write the given numbers into product of prime.

120 = 2 × 2 × 2 × 3 × 5

= 2³ × 3 × 5

90 = 2 × 3 × 3 × 5

= 2 × 3² × 5

HCF(90,120) = 2 × 3 × 5 = 30

LCM(90,120) = 2 × 3 × 3 × 5 = 360

__________________________

★ Additional Information:-

HCF of numbers = The largest or greatest factor

common to any two or more given natural numbers

is termed as HCF of given numbers.

LCM of numbers = A common multiple is a number

that is a multiple of two or more numbers.

__________________________