# How Much Math Is Needed To Learn How To Code Ultimate Mental Math Trick – How to Tell the Day for Any Date

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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 at hand? Is it really possible?

It’s actually a simple skill that anyone can learn. It is also very practical as you can always keep in mind your availability for an activity or an event or just know anyone’s birthday. All you need is a little practice, then you can quickly and easily tell the day of the week of almost any date in history or the future.

Here is the Secret

You may have 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 February is 1. The month codes with the corresponding mnemonics are the following:

January – 6 (WINTER has 6 letters)

February – 2 (2nd month)

March – 2 (Marches with 2 feet)

April – 5 (APRIL has 5 letters)

May – 0 (MAY 0 for mayonnaise)

June – 3 (JUN has 3 letters)

July – 5 (JULIE has 5 letters)

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

September – 4 (SEP has 4 letters)

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

November – 2 (second past 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 divided 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 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 Sunday)

Hooray! With constant practice, you are now ready to be the walking calendar. Amaze your friends, colleagues, students, teachers and everyone.

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