__25th Edition of Math And Multimedia Carnival__

What first comes to mind when we think about the number 25? It is a square number given by 5^{2 }? A quarter of a hundred? Or that movie The 25th Hour by Spike Lee where Barry Pepper was just so badass as a rogue Wall Street trader?

Well here are a few math-related fun facts about numero

__:__

**twenty-five**(i) It is the smallest square number in existence which can be achieved through the sum of two non-zero square numbers, ie 25 = 3

^{2}+ 4

^{2}

(ii) It can be expressed as the sum of an arithmetic series which comprises odd (positive) integers, ie 25=1+3+5+7+9

(iii) In 2-dimensional geometry, a 25-side polygon is known as an Icosikaipentagon or a Pentacosagon.

(iv) It is a Cullen number which can be represented in the format

*n*· 2

^{n}+ 1, where

*n*assumes the value of 3.

With that, allow me to begin things proper as I present the collection of entries for this current edition. Enjoy.

Colleen Young explores the concept of

**inequalities**with the Desmos graphing calculator, and separately informs us of this magnificent

**NASA Space Maths**website on her

**Mathematics Resources Page.**Those seeking means to prepare efficiently for maths examinations would most certainly find her post titled

**Revision Time!**helpful.

In case you haven't checked out Lance Friedman's

**Math Plane**website, I strongly encourage you to. When the skill-sets of algebra, trigonometry and calculus are acquired in a theme meticulously fashioned along the likes of an airport terminal, learning is nothing short of inspiring.

Over at

**Math Hombre**, John Golden has compiled a list of

**math iPad apps**recommended for a variety of activities including tools, games and curriculum learning. If you desire more,

**Study By App**hosts a large collection of educational apps where you can try locating a suitable virtual companion for your math revision. (Do note though these are not free.)

For the student getting weary of reading thick A level texts,

**Mavis Resources**will definitely be balm for the mind. A Java-applet laden interactive website, it covers majority of Further Pure 1-3 as well as Core 1 and 2. Fret not, chapters on mechanics and statistics are also featured here.

At

**Math Concepts Explained**, Shaun gives a detailed treatment of

**differential calculus for beginners**, while John Cook shares his insights about

**binomial coefficients**in his blog

**The Endeavour**. Incidentally, I have also written a piece to help students

**expand binomial series efficiently**-this is made available at my supplementary site

**The Mathematical Sharpener**.

Have you heard of the butler stick? Bon Crowder believes it can be

**transformed into a tool for teaching mathematics**. In her own words:

**" I found a strange math tool that was designed to do something other than teach - until now!"**

John Hunter pays a glowing tribute to the late statistician

**George Box**in his

**Curious Cat Management Improvement Blog,**emphasizing that beyond the realm of mathematics, he was a man of strength and goodness.

And the final stop: geometry and visualizations. Guillermo Bautista details a proof that links the

**triangle angle sum theorem and**

**inscribed angle sum theorem**in his

**Proofs From The Book**blog; whilst at it, you might also wish to read this

**interview**of Cambridge-trained Mathematician Jason Davies where he talks about numbers and pictures.( Credits to the

**Math Munch Team**for the contribution.)

That's all folks

**for this current edition of the Math And Multimedia Carnival.**

Peace.

PS: I would like to accord a sincere thank-you to

**Guillermo Bautista**for giving me the opportunity to contribute to this blossoming math blogging community. )

**15 May 2013**