**4**is the only number with the same number of letters in English ("four"). Submitted by: Mark Andrei P. Pagana - Cavite, Philippines

**2520**is the smallest number divisible by 1 to 10 (Least Common Multiple of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10). Submitted by: Jimmy Horton - England

A 3-digit result of any number multiplied by 21 × 11 = 13 × 11 = 44 × 11 = ... etc. Submitted by: Catrine Montano - Surigao, Philippines

**11**has its middle digit the sum of other two, like:**2**

*3*

**1**(

**2**+

**1**=

*3*)

**1**

*4*

**3**(

**1**+

**3**=

*4*)

**4**

*8*

**4**(

**4**+

**4**=

*8*)

The value of

**zero**was first used by the ancient Indian mathematician**Aryabhata**. Submitted by: Sundara Moorthy - Tiruppur, Tamil Nadu, India The sum of the digits of a number which is a multiple of 1+9+8+0=18 : 2+1+4+1+6+4=18 : etc.sciensational.com Submitted by: Vighneswar - India

**9**is always 9, ie,**45 :**

*4+5*= 9

**1980 :**

*1+8*= 9

**214164 :**

*1+8*= 9

**(Multiplication & Succession.)**Submitted by: Tyler - United States

The

**implicit curve**equation (x^{2}+y^{2}-1)^{3}-x^{2}y^{3}=0 produces the heart shape. Submitted by: Hyde - Toronto, Ontario, Canada The term

**Googol**(10^{100}, ie, 10 followed by 100 zeros) was invented by a 9-year old boy**Milton Sirotta**. Submitted by: Cynthia - San Francisco, California, United States The

**Reuleaux Triangle**is a shape of*constant width*other than a circle. Submitted by: Adarsh - Guraon, India^{2}

^{2}

^{2}

^{2}

**...**

The Seven Unsolved

Submitted by: Ravi - Mississauga, Ontario, Canada

**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

The 0 1 1 2 3 5 8 13 21 34 55 89 ... Submitted by: Matt - California, United States

**Fibonacci sequence**are numbers where each following number is the sum of the previous two: A

**Palindrome Number**is a number that reads the same backwards and forward, e.g. 13431. Submitted by: Yusuf - Victoria, Australia A US dollar can be made into small change in

**293**ways. You can remember the value of

**Pi**(3.1415926) by counting each word's letters in "**May I have a large container of coffee?**"sciensational.com**(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:

**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 Argete**2**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.sciensational.com