Question

hcf and lcm of 50 & 60
and 120 & 90

Answer 1

50 & 60
LCM - 300
GCF - 10

120 & 90
LCM - 360
GCF - 30

To find GCF, list down the factors of the numbers then select the greatest of their common factors.

To find LCM, list down the prime factors of the numbers then multiply the primes having the highest exponential value. 

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Answer 2

50&60
lcm-300
hcf-10
120&90
lcm-360
hcf-30