The "Least Common Multiple" (or LCM) of two (or more) numbers is the smallest number that contains each as a divisor.

Examples:

• The LCM of 15 and 21 is 105.
• The LCM of 105 and 70 is 210.
• The LCM of 154 and 455 is 70070.
Given two numbers x and y we have:
• $xy=hcf(x,y)~lcm(x,y)$
where HCF is the Highest Common Factor.
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