## Can’t Sleep – Try Mental Math

One night recently I woke up and could not go to sleep again.  I decided to distract my brain with some mental math and try to trick myself into going back to sleep.  The calculation $365 \times 67$ came naturally to mind since the product would be the number of days I was alive on my 67th birthday.  Here is the series of calculations that I performed.

Mental Math Example

Later I checked my answer of Wolfram Alpha (It will calculate the difference between two dates).  It was $24472$.  Exactly right.  And no I still couldn’t go back to sleep so I got up and read for a couple of hours.