This was literally part of my first programming assignment in college. Can people really not do this? Isn't fizzbuzz considered too obvious these days? I feel like I must be misunderstanding...
Several of the examples in the article are the basic ones, though: test, set, clear or toggle a bit. You might not remember the trick for finding the least significant 1 bit, but it's not as if testing whether a number is odd or even is some sort of arcane knowledge. Anyone who has to resort to Google or Stack Overflow for something so simple is going to struggle in large parts of the programming industry.