This hub pages website gives useful tips in mental mathematics.
Read about the life of Trachtenberg in this website. I salute the spirit of the genius who refused to accept defeat and found calmness and solace amidst death and destruction.
This is a very good site containing good puzzles which could give work out to your brain. Do pay a visit to this web site http://playwithyourmind.com/
This site contains useful things which everybody needs like how to tackle the bullies etc http://www.livejournal.com/
This site gives knowledge about the current affairs.
Any person who is serious to know about magic squares, stars, cubes etc will necessarily have to come to these websites http://www.recmath.com/
These websites are a compilation or, we can also say the bible of the magic squares, cubes etc.
This website is also from Grogono and it is a treasure trove of knots. I was wonder struck with this one. It is useful to the students in general and the scouts and the National Cadet Corps in particular. www.animatedknots.com
This website is a free Math resource for Mathematics from Algebra to Differential equations. It is being run by people who are Doctorates in Mathematics. http://www.sosmath.com/index.html