Mathematics Facts & Trivia

ElevenA 3-digit result of any number multiplied by 11 has its middle digit the sum of other two, like: 21 × 11 = 231 (2+1=3) 13 × 11 = 143 (1+3=4) 44 × 11 = 484 (4+4=8) ... etc. Submitted by: Catrine Montano - Surigao, Philippines
ZeroThe value of zero was first used by the ancient Indian mathematician Aryabhata. Submitted by: Sundara Moorthy - Tiruppur, Tamil Nadu, India
NineThe sum of the digits of a number which is a multiple of 9 is always 9, ie, 45 : 4+5 = 9 1980 : 1+9+8+0=18 : 1+8 = 9 214164 : 2+1+4+1+6+4=18 : 1+8 = 9 etc. Submitted by: Vighneswar - India
Eight 9 × 9 + 7 = 88 98 × 9 + 6 = 888 987 × 9 + 5 = 8888 9876 × 9 + 4 = 88888 98765 × 9 + 3 = 888888 ... (Multiplication & Succession.) Submitted by: Tyler - United States
Heart equationThe implicit curve equation (x2+y2-1)3-x2y3=0 produces the heart shape. Submitted by: Hyde - Toronto, Ontario, Canada
GoogolThe term Googol (10100, ie, 10 followed by 100 zeros) was invented by a 9-year old boy Milton Sirotta. Submitted by: Cynthia - San Francisco, California, United States
Reuleaux triangleThe Reuleaux Triangle is a shape of constant width other than a circle. Submitted by: Adarsh - Guraon, India
1333 17 689 = 1332 177 6889 = 13332 1777 68889 = 133332 17777 688889 = 1333332 ... Submitted by: Laxmana Perumal - Nagercoil, India
Millennium PrizeThe Seven Unsolved Millennium Prize Math Problems are:
1. P versus NP problem
2. Hodge Conjecture
3. Poincaré conjecture (solved in 2002)
4. Riemann Hypothesis
5. Yang-Mills Existence and Mass Gap
6. Navier-Stokes Existence and Smoothness
7. Birch and Swinnerton-Dyer Conjecture
Submitted by: Ravi - Mississauga, Ontario, Canada
Fibonacci tile The Fibonacci sequence are numbers where each following number is the sum of the previous two: 0 1 1 2 3 5 8 13 21 34 55 89 ... Submitted by: Matt - California, United States
Palindrome Number 13431A Palindrome Number is a number that reads the same backwards and forward, e.g. 13431. Submitted by: Yusuf - Victoria, Australia
Dollar in change 293A US dollar can be made into small change in 293 ways.
PiYou can remember the value of Pi (3.1415926) by counting each word's letters in "May I have a large container of coffee?"
Multiply 1 × 8 + 1 = 9 12 × 8 + 2 = 98 123 × 8 + 3 = 987 1234 × 8 + 4 = 9876 12345 × 8 + 5 = 98765 123456 × 8 + 6 = 987654 ... (Multiplication & Succession.) Submitted by: Moi, Canada.
142857142857 is a cyclic number, i.e., its digits are rotated around when multiplied by any number from 1 to 6. Like this: 142857 × 1 = 142857 142857 × 5 = 7 14285 142857 × 4 = 57 1428 142857 × 6 = 857 142 142857 × 2 = 2857 14 142857 × 3 = 42857 1 Submitted by: Moi, Canada.
1089 98011089 multiplied by 9 gives an exact reverse: 9801.
One ThousandFrom 0 to 1000, the letter "A" only appears in 1000 ("one thousand"). Submitted by: Ramil Argete
Two2 is called the "oddest" Even-Prime number. 2 is a unique Even-Prime because while all Evens are divisible by 2, any number apart from 2 that is divisible by 2, is not a Prime.
1111 1 × 9 + 2 = 11 12 × 9 + 3 = 111 123 × 9 + 4 = 1111 1234 × 9 + 5 = 11111 12345 × 9 + 6 = 111111 ... (Multiplication & Succession.)
Forty40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in reverse order.