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Calendar Trick

monthly calendar
.
Ask what, day, month and year the person was born.
Then tell them which day of the week this person was born.

How to predict the day :

Example :

Let us assume the person reveals that his date of birth was February 12, 1978.

Two formulas are used for prediction :

January, October = 0
May = 1
August = 2
February, March, November = 3
June = 4
September, December = 5
April, July = 6


Sunday = 0
Monday = 1
Tuesday = 2
Wednesday = 3
Thursday = 4
Friday = 5
Saturday = 6

1 - Drop the "19" in the year of birth  (1978 becomes 78)
2- Divide this number by 4 and drop the remainder (78 / 4 = 19  remains 2)
3- Add this answer to year of birth  ( 19 + 78 = 97)
4- Add the day of the month of birth to this total (97 + 12 = 109)
5- From the first formula, add the value of the month (February = 3,  109 + 3 = 112)
6- Divide this total by 7 (112 / 7 = 16 remains 0)
7- Take this remainder (0) and apply this number to the days in formula 2)  0 = Sunday

Therefore, he was born on a Sunday.

Go amaze someone!

PS: Try these Math printable activities


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