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Calendar Trick

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 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