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Ultimate Mental Math Trick – How to Tell the Day for Any Date

Can you tell the day of any date without a calendar handy? Is it really possible?

It’s actually a simple skill that anyone can learn. It’s also very convenient because you can always take into account your availability for an activity or an event or you just need to know the day of someone’s birthday. All it takes is a little practice, and then you’ll be able to quickly and easily tell the day of the week for virtually any date in history or the future.

Here is the secret

You may need to memorize some codes to learn this trick, but they are very easy to remember.

First, we assign a code number to each day of the week.

Monday – 1

tuesday – 2

Wednesday – 3

Thursday – 4

Friday – 5

saturday – 6

Sunday – 7 or 0

Second, we assign a code number to each month of the year. These month codes are used for every year with two exceptions. In a leap year, the month code for January is 5 and for February is 1. Month codes with the mnemonic are the following:

January – 6 (WINTER has 6 letters)

February – 2 (2nd month)

March – 2 (You walk with 2 feet)

April – 5 (APRIL has 5 letters)

May – 0 (MAY0 for mayonnaise)

June – 3 (JUN has 3 letters)

July – 5 (JULIE has 5 letters)

August – 1 (August starts with an A, the 1st letter)

September – 4 (SEPT has 4 letters)

October – 6 (Halloween TRICKS or TREATS have 6 letters each)

November – 2 (2nd of last month)

December – 4 (XMAS has 4 letters)

Third, we assign a code number for each year. For example, the year code for 2011 is 6.

The formula

Day of the week = (Month code + Date + Year code) mod 7

Note: mod 7 indicates the remainder you get when you divide by 7.

Examples

What day is July 16, 2011?

Day of the week = (Month code + Date + Year code) mod 7

Day of the week = (5 + 16 + 6) mod 7 = 27 mod 7 = 6 (So it’s a Saturday)

What day is December 25, 2011?

Day of the week = (Month code + Date + Year code) mod 7

Day of the week = (4 + 25 + 6) mod 7 = 35 mod 7 = 0 (So it’s a Sunday)

Hooray! With consistent practice, you are now ready to be the walking schedule. Surprise your friends, colleagues, students, teachers and everyone else.

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