Highest Common Factor (HCF) refers to a set of two or more different numbers that can be divided by exactly or a common number. HCF is also called as Greatest Common Divisor (GCD) or Greatest Common Measure (GCM).
Least Common Multiple (LCM) refers to the smallest quantity of number that is divisible by two or more given quantities of number without a remainder. For example: 12 is the least common multiple of 2, 3, 4, and 6.
Highest Common Factor (HCF) and Least Common Multiple (LCM) are calculated by either factorization method or division method.