How many odd numbers are 1 to 180?

To find the odd numbers from 1 to 180, we note that the sequence of odd numbers starts at 1 and ends at 179. The odd numbers can be expressed as 1, 3, 5, ..., 179, which forms an arithmetic sequence with a common difference of 2. The number of terms in this sequence can be calculated using the formula for the nth term of an arithmetic sequence: (n = \frac{(last - first)}{difference} + 1). Thus, the count of odd numbers is (\frac{(179 - 1)}{2} + 1 = 90).