Question

finding H.C.F of two numbers a&b​

Answer 1

a × b = HCF × LCM

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Answer 2

To find the HCF of two numbers:

Express each number as a product of prime factors.

Choose all the prime factors which are in common in the two numbers.

The HCF is the product of the chosen prime factors.

One way to find the least common multiple of two numbers is to first list the prime factors of each number. Then multiply each factor the greatest number of times it occurs in either number. If the same factor occurs more than once in both numbers, you multiply the factor the greatest number of times it occurs.