On your nth birthday, you turn n – 1 years old.

birthday cake

As a teacher, I have had variants of this conversation many times. The specific details, however, are fictional, for this changes, somewhat, each time it happens.

  • Student: Guess what? It’s my birthday!
  • Me: Congratulations! How old are you?
  • Student: I’m seventeen!
  • Me: Well, happy 18th birthday, then!
  • Student: Huh?
  • Me: Look, on that one day, 17 years ago, when you were born, that was your birthday. That day has a better claim on being your birthday than any other day, because it’s the day you were born. That was your first birthday. But you weren’t one year old yet. You turned one year old a year later, on your next birthday . . . your second birthday. A year later, on your third birthday, you turned two years old. Do I need to continue?
  • Student: So I’m 18? I can buy cigarettes without a fake ID, and vote, and stuff?
  • Me: No, not for another year, because you’re only 17 years old — but you have had 18 birthdays. Say, here come some of your friends. Use this bit yourself, if you want to, and have fun with it.
  • Student, to other students: Hey, guys, it’s my birthday! I’m 18 today!

…At least I try. Also, sometimes, the educational outcome is better than in this fictionalized example.

 

[Image source: http://www.decorationnako.tk/birthday-cake/]

About RobertLovesPi

I go by RobertLovesPi on-line, and am interested in many things. Welcome to my little slice of the Internet. The viewpoints and opinions expressed on this website are my own. They should not be confused with the views of my employer, nor any other organization, nor institution, of any kind.
This entry was posted in Education, Life, Mathematics and tagged , , , , , , , , . Bookmark the permalink.

One Response to On your nth birthday, you turn n – 1 years old.

  1. Pingback: My Birthday Stars for 2016 | RobertLovesPi's Blog

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s