Well, let's see . . .
13 x 8 = 104. That's the smallest one.
13 x 76 = 988. That's the biggest one.
So all of the multiples of 13 ... from the 8th to the 76th ... are 3-digit numbers.
That's the same as saying: "The first 76 multiples except for the first 7."
So there are (76 - 7) = 69 of them.
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