“Together again / least number” → LCM. “Greatest length / largest size that fits exactly” → HCF.
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Three temple bells in Varanasi ring at intervals of 4, 9, 18 seconds. If they ring together now, after how many seconds will they next ring together?
Answer: 36 seconds
Three pieces of cloth at a shop in Surat measure 28 cm, 42 cm, 126 cm. What is the greatest length (in cm) of a measuring stick that can measure all three exactly?
Answer: 14 cm
Find the greatest number that divides 41, 79, 134 leaving remainders 1, 9, 4 respectively.
Answer: 10