There are 80 positive integers from 1 to 80.
Half of them are even, the other half are odd.
So there are 40 even integers from 1 to 80.
2, 4, 6, and 8 have only 1 digit.
All the rest have 2 digits.
So the answer is (40 - 4) = 36 .
However, as the question asked "less than 80" we can not include 80 and so the answer is 35.
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The set of positive odd integers.
The positive even integers are: 0 2 4 6 and 8
The positive integers less than 11 are the natural numbers 1-10.That is to say 1,2,3,4,5,6,7,8,9 and 10.
One less than 10000.
The squares -- nine of them.