Search engines are imperfect. A portion of my visitors ask a specific question, but I am answering a different one. Google isn’t yet smart enough to see the subtleties, and directs them to HowTutorial.com. I hope they found what I wrote interesting, but I admit they must remain unsatisfied.

This is the second time I will be collecting questions that need answers from my search logs. The first time, after a series of posts about math shortcuts, I wanted to help someone with a misconception. This time is two trick questions.

Question: What is one number that’s divisible by everything?

Answer: That is a trick question. Instead of trying to solve for such a number, let me tell you that the number is zero. Through a little thinking, you can agree that it is true. 1/4th minus 1/4th equals zero fourths. That is 0/4ths. No forths at all. Nada. Zero. Zero divided by 4 is zero. 0/2=0, 0/9299292929=0, zero divided by everything is zero. The only exception, is 0/0 = undefined. So with that exception, zero is the one number that is divisible by everything.

Question: What number is divisible by all 9 numbers 1 to 9?