Math Facts

169,518,829,100,544,000,000,000,000,000 ways to play the first ten moves in a game of chess!
111,111,111 x 111,111,111 = 12,345,678,987,654,321
A 'jiffy' is an actual unit of time for 1/100th of a second.
1 and 2 are the only numbers where they are the values of the numbers of factors they have.
'Forty' is the only number that has all its letters in alphabetical order.
'FOUR' is the only number in the English language that is spelt with the same number of letters as the number itself
Multiply 37,037 by any single number (1-9), then multiply that number by 3. Every digit in the answer will be the same as that first single number.
1x9 +2 = 11 , 12x9 +3 = 111 , 123x9+4 = 1111 etc
2 and 5 are the only primes that end in 2 or 5.
The 772-778 digits of pi are 9999998, the greatest sum of 7 consecutive digits in the first 1,000,000 or so digits.


There are 2,598,960 five-card hands possible in a 52-card deck of cards.
142857 is a cyclic number, the numbers of which always appear in the same order but rotated around when multipled by any number from 1 to 6. 142857 * 2 = 285714 142857 * 3 = 428571 142857 * 4 = 571428 142857 * 5 = 714285 142857 * 6 = 857142
Tycho Brahe, a 16th century astronomer, lost his nose in a duel with one of his students over a mathematical computation. He wore a silver replacement nose for the rest of his life.
If you multiply 1089 x 9 you get the exact reverse, 9801.
What Day of the Week Were You Born On?
Even though you were there at the moment of your birth, you may not remember exactly what day of the week it was. In fact, not only will this method help you find that out, you can find out the day of the week for any date you want in the 1900's. Here is a little trick to help you figure what day that was:
Step 1) Write down the last two digits of the year. Call it A.
Step 2) Divide that number by four dropping the remainder call this answer B.
Step 3) Find the month number corresponding to the month from the table below. Call it C.
Step 4) The day call it D.
Step 5) Take the century number of the year and divide it by four.
If the remainder is 0 then E = 6
If the remainder is 1 then E = 4
If the remainder is 2 then E = 2
If the remainder is 3 then E = 0
Step 6) Now add A+B+C+D+E. Divide this sum by 7. The remainder you get is the key to the day of the week.
Step 7) In the table of days below, match the remainder with the day of week.

TABLE OF MONTHS		TABLE OF DAYS		LEAP YEARS
		Sunday = 1		If year divides 400, yes
Jan = 1 (0 in leap year)	July = 0	Monday = 2		If year divides 100, no
Feb = 4 (3 in leap year)	Aug = 3	Tuesday = 3		If year divides 4, yes
Mar = 4	Sept = 6	Wednesday = 4		If year does not divide 4, no
April = 0	Oct = 1	Thursday = 5
May = 2	Nov = 4	Friday = 6
June = 5	Dec = 6	Saturday = 0