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Home True 2011 Date Oddity – Birth Year Plus Age Equals 111

2011 Date Oddity – Birth Year Plus Age Equals 111

by Brett M. Christensen

This circulating message noted that if you add the last two digits of your birth year to the age that you were in the year 2011 you will come up with 111.  Theis number was significant in the year 2011 because the year had four dates that consist of multiples of the number 1, such as 11/11/11.

This message was shared via Facebook and other social networks and also circulated via email. 

It first notes that the year 2011 featured four unusual dates that are made up of multiples of the number one, specifically 1/1/11, 1/11/11, 11/1/11, and 11/11/11. It then outlined the following math trick.

If you add the last two digits of the year you were born to the age that you will be this year, your answer will be the number 111. The message implies that the answer “111” is particularly significant because of the unusual prevalence of “1’s” in 2011 dates.

Of course, it is certainly true that 2011 has four dates made up of multiple “1’s.”

And the math trick does work for people born in the last century. For example, I was born in the year 1963. I will be turning 48 this year. So:

  • 63 + 48 = 111

For those born this century, the trick still works but the answer will be two digits rather than three. For example, if a person was born in 2005, he or she would be turning 6 this year. So:

  • 05 + 6 = 11

However, except for the prevalence of dates that have multiples of the number 1, the trick is not specific to the year 2011. For example, in 2010 the calculation came to the number 110, i.e. the last two digits are the same as the year. For example, given that I was born in 1963:

  • 2010: 63 + 47 = 110
  • 2009: 63 + 46 = 109
  • 2012: 63 + 49 = 112

Thus, while the trick is certainly interesting – at least at first glance – it is not specifically connected to the year 2011.

In fact, broken down, the “trick” is actually fairly basic math.  A post on the Math Questions blog provides a more in-depth discussion on the issue.

Example

Subject: oddly strange

This year we will experience 4 unusual dates…. 1/1/11, 1/11/11, 11/1/11, 11/11/11 ……… So figure this out…. take the last 2 digits of the year you were born plus the age you will be this year and it WILL EQUAL …. 111



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Brett Christensen