3. HCF And LCM| Mathematics| seven|

The HCF defines the greatest factor present in between given to or more numbers , wheras LCM defines the least number which is exactly divisible by two or more numbers. HCF is also called the greatest comon factor ( GCF) and LC m is also called The least common divisor. Two numbers which have only 1 as a common factor are said to be Co prime or relatively prime or naturally prime numbers. Ex.

10 and 21 are Co prime, because the divisors of 10 are 1,2,5,10 while divisors of 21 are 1,3,7,21 and only common to both 10 and 21 is 1.

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