When their GCF is greater than 1.
When they have a prime factor in common.
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The LCM of two numbers is the product of the numbers if one of the numbers is a prime. Since 11 is a prime, the LCM of 10 and 11 is 110 (10 x 11). If neither number had been a prime, the LCM would have been the product of all the prime factors of the numbers to their greatest power.
No, the only way the GCF and LCM of two numbers can be the same is if the numbers are the same.
Yes,LCM of two numbers is their product.
The product of the GCF and the LCM of two numbers is equal to the product of the original two numbers. Multiply the GCF and the LCM. The original two numbers will be another factor pair of that total. Find the factor pair that has that GCF and LCM.
Product of the two prime numbers is the LCM. For example 3, 7 have 21 as LCM