They are the hundred numbers of the form 5*k where k = 1, 2, 3, ...
So, get a calculator and work out
5 x 1
5 x 2
5 x 3
all the way to
5 x 100.
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The multiples of 5 that are also multiples of 6 are multiples of their LCM. The LCM of 5 and 6 is 30, so the question becomes which multiples of 30 are less than 100? The solution is the numbers: 30, 60, 90
20
-15
The main generalization you can make about all multiples of 5 would be that they will either end in the digit 0 or 5. So 5, 487975, 100, and so on all are multiples of 5. I don't believe there are any other generalizations that can be made about it.
There are five multiples of six that fall between 70 and 100: 72, 78, 84, 90, 96.