DEFINITION OF LCM AND HCF

Highest Common Factor (H.C.F)

It is also called Greatest Common Diviser(G.C.D). When a greatest number divides perfectly the two or more given numbers then that numbers are called the H.C.F of two or more given numbers

Eg: The H.C.F of 10,20,30 is 10 as they are perfectly divided by 10,5 and 2 and 10 is highest or greatest of them.

Least Common Factor (L.C.M)

The Least number which is divisible by two or more given numbers. that least numbers is called L.C.M of the numbers.

L.C.M. of 3,5,6 is 30, because all 3 numbers divide 30,60,90, ....... and so on perfectly and 30 is minimum of them.