Every number has 1 as a factor.
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They are the common multiples of the two numbers.
All numbers have multiples. Some numbers have some of the same multiples as other numbers. These are known as common multiples. On the list of common multiples, one number is the smallest. This is the least common multiple.
the multiples of one hundred is 100,200,300,400,500,600,700,800,900, and so on.
There are infinitely many multiples of 9 and 21 so it is impossible to list them. One of their multiples is 9*21 = 189.
42 of them.