How do we know when to find lcm and hcf in word problems.

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We can know that we have to use LCM or HCF in a question by some words in the word problem because in that if some words like : smallest , least , etc are used that means you have to use LCM whereas for HCF words like : greatest , biggest , largest , etc are used that means you have to use HCF here.
regards
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smallest , greatest , least are some keywords that do help
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