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Tis simple!!

TO solve HCF:
Write down all the factors of the given numbers. Cross out repeating numbers. Find the biggest crossed number. That is the HCF.

TO solve LCM:
Write all the multiples of given numbers. Cross repeaters.Find the smallest of them. That is the LCM.

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To find HCF take the common factors of given number and it is HCF
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What about LCM?
And what you've just said isn't quite right. What if there are three or four common factors?
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