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The full form of HCF is Highest Common Factor , and the full form of LCM is Lowest Common Multiple. Both are foundational concepts in mathematics, frequently appearing in school exams, competitive tests, and everyday arithmetic problem-solving. The full form of HCF is “ Highest Common Factor “. Highest Common Factor ( HCF ) of two or more numbers (say a,b,c….)is the highest number by which a,b,c… are divisible,or the highest number which is a factor of a,b,c…. HCF stands for Highest Common Factor while LCM stands for Least Common Multiple. The Highest Common Factor is the greatest number that divides each of the two or more numbers. HCF is also called the Greatest Common Measure (GCM) and Greatest Common Divisor (GCD). HCF stands for Highest Common Factor and LCM stands for Least Common Multiple. Learn how to find them using prime factorization and division methods with examples and practice questions.