A Neat Math Trick That Will Only Work This Year

I learned a neat math trick that will only work this year.  Take the year you were born (the last two numbers) and add it to the age you will be this year on your birthday.  It will always equal 111!

Example:  Birthyear: 1977                Age at Birthday this year: 34

77+34=111

It works every time, but it will only work this year!


Does anyone know why this works???