# #90: A Ridiculous, Long Way to Find Out the Day of the Week You Were Born

#### Do you know what day of the week you were born on?  If not, you could…

1. Ask your parent(s)/guardian(s) if they remember the day of the week.
2. You could “Google”: What day of the week was May 16, 1975 (that’s my birthday)

## OR

#### You can do this ridiculously long way…which is more fun IMO!

1. Set up your math mini spark recording page: #90: A Ridiculous, Long Way to Find Out the Day of the Week You Were Born

Step 1: Take the last 2 digits of the year in which you were born.

Step 2: Divide that number by 4 and ignore any remainder.

Step 3: Add the day of the month.

Step 4: Add the month’s key value.

January and October:Key Value = 1

February, March, and November: Key Value = 4

April and July: Key Value = 0

May: Key Value = 2

June: Key Value = 5

August: Key Value = 3

September and December: Key Value = 6

Step 5: Subtract 1 for January or February of a leap year.

Step 6:

Add 0 if the date is in the 1900s

Add 6 if the date is in the 2000s

Step 7:  Add the last 2 digits of the year.

Step 8: Divide by 7 and take the remainder.

Remainder 1 is Sunday

Remainder 2 is Monday

Remainder 3 is Tuesday

Remainder 4 is Wednesday

Remainder 5 is Thursday

Remainder 6 is Friday