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We have to use LCM when they give d questions when two thing is happening same time for ex priya takes 18 min to run around d circular path, while asha take 12 min for d same. if they start at d same point. at what time will they meet again.
HCF- if they give two no & ask u to find separately then u apply hcf. for ex there r104 students in both class 9&10 .for annual exam they have to sit 2 in each desk such that same class students should not sit on 1 bench find the no of benches are needed . apply hcf for dis