Question

what is HCF and LCM
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Answer 1

HCF=highest common factor

LCM=least common multiple

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Answer 2

$\huge \sf \fbox \pink{hcf}$

In mathematics, the greatest common divisor of two or more integers, which are not all zero, is the largest positive integer that divides each of the integers. For two integers x, y, the greatest common divisor of x and y is denoted {\displaystyle \gcd}.

formula

Greatest common divisors can be computed by determining the prime factorizations of the two numbers and comparing factors. For example, to compute gcd(48, 180), we find the prime factorizations 48 = 24 · 31 and 180 = 22 · 32 · 51; the GCD is then 2 · 3 · 5 = 22 · 31 · 50 = 12, as shown in the Venn diagram

$\huge \sf \fbox\purple{lcm}$

In arithmetic and number theory, the least common multiple, lowest common multiple, or smallest common multiple of two integers a and b, usually denoted by lcm, is the smallest positive integer that is divisible by both a and b. Wikipedia