How Many People Share Your Birthday?

Here's your nightly math! Just 5 quick minutes of number fun for kids and parents at home. Read a cool fun fact, followed by math riddles at different levels so everyone can jump in. Your kids will love you for it.

How Many People Share Your Birthday?

March 6, 2016

Your birthday is the best, most awesome day in the world. It marks an exact number of years since the day you were born — a huge deal. Of course, we got great questions about this from not one but two of our fans. Paige O. asked us, how many babies are born each day? Then Megan S. asked, how many people share your birthday? (and thank you ladies for the great artwork!) If you think about it, they’re asking the same thing. The day you were born, you weren’t the only baby starting life that day, or even that hour. Every day about 353,000 babies are born! That comes to more than 240 babies every minute, and the number keeps going up. So lots of people share your birthdate, and many of those people even have the same exact time as yours listed on their birth certificates. But don’t worry — you still get your own cake.

Wee ones: How many years ago were you born? Count up to your age!

Little kids: What’s the month and date of your birthday? Which are you closer to, your last birthday, or the birthday that’s coming up?  Bonus: If you subtract the year you were born from 2016, do you get your age? If not, why not?

Big kids: If every minute exactly 240 babies are born, how many babies share your birth minute with you?  Bonus: How many babies are born each second?

The sky’s the limit: If 353,000 babies (including you) were born the day you were born, how many people share your exact birthdate?

 

 

 

Answers:
Wee ones: Different for everyone…and count 1, 2, 3…to your age.

Little kids: For birthdays from March 7 up to and including September 4, your next birthday is closer (if you read this on March 6). For birthdays since September 6 up to today, your last birthday is closer. If your birthday is September 5, it’s equal either way because of Leap Day this year.  Bonus: If you get a number 1 more than your age, it means your 2016 birthday hasn’t happened yet. On that day, you will be exactly that many years from your birth year, and your age will match.

Big kids: 239 babies.  Bonus: 4 babies every second!

The sky’s the limit: 352,999 other people.

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About the Author

Laura Overdeck

Laura Overdeck

Laura Bilodeau Overdeck is founder and president of Bedtime Math Foundation. Her goal is to make math as playful for kids as it was for her when she was a child. Her mom had Laura baking while still in diapers, and her dad had her using power tools at a very unsafe age, measuring lengths, widths and angles in the process. Armed with this early love of numbers, Laura went on to get a BA in astrophysics from Princeton University, and an MBA from the Wharton School of Business; she continues to star-gaze today. Laura’s other interests include her three lively children, chocolate, extreme vehicles, and Lego Mindstorms.

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