Answer
1. Set a variable "found" to False
2. Iterate through the list of sorted numbers
3. If the given number is equal to the current number in the list, set "found" to True
4. If the given number is greater than the current number in the list, move to the next number in the list
5. If the given number is less than the current number in the list, stop the iteration
6. Return the value of "found"