The LCM of 6 and 9 is 18.
The LCM of 7 and 9 is their product. There is no common multiple that is smaller.
There isn't a GCM (greatest common multiple) because multiples have an unlimited supply; numbers have no end. For example, the number 10,000,000,000,000 is smaller than 10,000,000,000,000,000,000,000.
Multiply any two numbers together. Their product will be a common multiple of the two.
The least common multiple of 2 and 2255 is their product
Their product.
Their product.
Their product.
Their product.
Their product.
Their product.
Their product.
Their product.