Every once in awhile you come across a pretty good free text online. This particular text in PDF is Abstract Algebra: The Basic Graduate Year. You'll find problems to work on through each of the chapters with the solutions at the end. If this is a topic you're up against, you'll want to give it a bookmark. Posted by the University of Illinois.

The use of mammography x-ray for breast cancer detection has received some greater scrutiny over its effectiveness, (false positives and false negatives) however, it remains the most popular choice to date. New research (SIAM Journal on Applied Mathematics) is looking promising at another method that may not only be more effective but also more economical. It uses a mathematical model for imaging tumors in the breast using microwave tomography. See the full story in Science Daily.

We all often think of percent as out of 100, fair enough as it does refer to per 100. However, percent deals with decrease, increase and change. Understanding percent and how to use it comes in very handy in every day math. These tutorials help prep you with the everyday math info you need.

See also, the percent calculator.

The  availability of great calculators online has lessened the need to find that old handheld. Not only that, most celluar phones also come equipped with calculators.  When you're in need of a calculation,  check out the variety of calculators here. You'll find prime number calculators, prime number calculators, fraction calculators and much, much more. For the higher end maths or advanced college level calculators, you'll want to check out the Maplesoft site which has some pretty oustanding online calculators for equations, plots, matrix, minimums and maxiums to name just a few.