Birthday Math Trick

birthday math trick
Pin It

Are you ready to spice up math class with this pretty cool birthday math trick!

This little math trick should make you seem like a sort of math genius.  Have fun with it.  It will involve some math calculations so be sure the person does the math correctly.

Note: Make sure you try this trick out for yourself first, using your own birthdate.

There is an example that follow the steps.

  • Add 18 to the month they were born
  • Multiply by 25
  • Subtract 333
  • Multiply by 8
  • Subtract 554
  • Divide by 2
  • Add their birth date
  • Multiply by 5
  • Add 692
  • Multiply by 20
  • Add only the last two digits of their birth year
  • Subtract 32940 to get their birthday!

Pretty Cool Math Stuff!

Here's an example below...

Let's suppose someone has a birthdate of August 22, 1964.

So we want to use the format of month/day/year so this birthdate would be 08/22/64.

Notice we only used two digits for the year.

  1. 18 + 8 = 26
  2. 26 x 25 = 650
  3. 650 - 333 = 317
  4. 317 x 8 = 2536
  5. 2536 - 554 = 1982
  6. 1982 / 2 = 991
  7. 991 + 22 = 1013 
  8. 1013 x 5 = 5065
  9. 5065 + 692 = 5757
  10. 5757 x 20 = 115140
  11. 115140 + 64 = 115204
  12. 1295204 - 32940 = 82264

And there you have it....8 22 64 which is the same as August 22nd, 1964!


If you enjoyed that trick you probably also like this bit of birthday math trivia.  Also notice the next two links below will take you to the main math tricks and trivia pages.

Kids don't want the same ol' boring math routine.  So that's why keeping gthe math interesting and engaging with math tricks, puzzles , games, etc. we're helping to motivate students to think more positive about math.  I mean, don't we usually feel good about the things if we're having fun?


Go to main Math Tricks page

Go to main Math Trivia page

Return from Birthday Math Trick to Math Games Home