We Know Your Birthday

• Multiply the month (number) of your birth by 7

• Subtract 1

• Multiply by 13

• Add the day of your birth

• Add 3

• Multiply by 11

• Subtract the month of your birth

• Subtract the day of your birth

• Divide by 10

• Add 11

• Divide by 100

The number you have is your birthday in the form MM.DD