I remember the day when I was a kid I was watching Stan Lee's Superhuman show on discovery channel where a man was calculating 2x2 digit number mentally so fast that we can't even imagine.
As a kid, I got so influenced by it that it increased my curiosity to become a Mental Math calculator.
I always excite people by doing some math magic tricks like calculating their day of birth within a sec just by listening to their date of birth.
Trust me when I do that it gives people the impression that I'm some kind of genius.
People seldom know the trick so they appreciate it.
After completing all my lectures(current and future) I promised you will be able to do problems that you never thought you could master.
You'll be impressed.........by yourself!