Mon September 09, 2013 By: Amuthavalli Thayyal Gopala Krishnan

How will we come to know when to do HCF or LCM in a problem?

Expert Reply
Mon September 09, 2013
Here are a few tips to recognise what needs to be determined

Look for what quantities  to be determined, If the problem asks for maximum  things, like  Find the maximum numbers of rooms required, greatest size of a measuring can, etc  

then we need to find HCF, 

If the problem asks for simultaneous reoccurrence of events then find LCM.

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