

That math process for adding the two numbers - there’s nothing wrong with it at all. Estimate the total and come up with a range. Determine exactly what the last digit is. In the example, there’s only one number in the range with 5 as the last digit. That must be the answer. Hell, I might even use that same method in my own head.
The poetry example, people use that one often enough, too. Come up with a couple of words you would have fun rhyming, and build the lines around those words. Nothing wrong with that, either.
These two processes are closer to “thought” than I previously imagined.
Reminds me of Asimov’s Foundation.