Relationship between H.C.F and L.C.M of Two Numbers

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The relationship between H.C.F and LCM is really easy to find once you get the point. So for example if we have the two numbers 6 and 9 we first have to find the LCM of each of the two numbers then the H.C.F of each number as well:

6= 6, 12, 18, 24, 30

9=9, 18, 27, 36, 45

LCM=18

6=2 x 3

9=3 x 3

HCF=3

So now we know that the LCM of 6 and 9 is 18 and the HCF of 6 and 9 is 3 so the theory is that:

LCM=18 

HCF=3

=6x9=54 and 18x3=54

Now try some of these and make sure to watch the video on YouTube.

Sheet 1 What is the Relationship between HCF and LCM