Mathematics Facts & Trivia

Any 2-digit number multiplied by 11 is a 3-digit number where the middle digit is 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, PhilippinesThe value of zero was first used by the ancient Indian mathematician Aryabhata.Submitted by: Sundara Moorthy - Tiruppur, Tamil Nadu, IndiaThe sum of the digits of a number which is a multiple of9 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 - India9 × 9 + 7 = 88 98 × 9 + 6 = 888 987 × 9 + 5 = 8888 9876 × 9 + 4 = 88888 98765 × 9 + 3 = 888888 987654 × 9 + 2 = 8888888 ... (Multiplication & Succession.)Submitted by: Tyler - United StatesThe implicit curve equation(x²+y²-1)³-x²y³=0 produces the heart shape.Submitted by: Hyde - Toronto, Ontario, CanadaThe term Googol (10¹⁰⁰, ie, 10 followed by 100 zeros) was invented by a 9-year old boyMilton Sirotta.Submitted by: Cynthia - San Francisco, California, United StatesThe Reuleaux Triangle is a shape of constant width other than a circle.Submitted by: Adarsh - Guraon, India 17 689 = 133² 177 6889 = 1333² 1777 68889 = 13333² 17777 688889 = 133333² 177777 6888889 = 1333333² ... Submitted by: Laxmana Perumal - Nagercoil, IndiaThe Seven UnsolvedMillennium 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 ConjectureSubmitted by: Ravi - Mississauga, Ontario, CanadaThe 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 StatesA Palindrome Number is a number that reads the same backwards and forward, e.g.13431.Submitted by: Yusuf - Victoria, AustraliaYou can remember the value of Pi(3.1415926) by counting each word's letters in "May I have a large container of coffee?" 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.142857 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 multiplied by 9 gives an exact reverse: 9801.From 0 to 1000, the letter "A" only appears in 1000 ("one thousand").Submitted by: Ramil Argete2 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.1 × 9 + 2 = 11 12 × 9 + 3 = 111 123 × 9 + 4 = 1111 1234 × 9 + 5 = 11111 12345 × 9 + 6 = 111111 123456 × 9 + 7 = 1111111 ... (Multiplication & Succession.)Submitted by: Rob40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in reverse order.Submitted by: Rob
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