Purplemath

Purplemath is located in Addison, United States on 329 S Wisconsin Ave. Purplemath is rated 3 out of 5 in the category educational institution in United States. Purplemath, Inc is a free-access algebra-lessons web site. Purplemath's lessons were written by Elizabeth Stapel, initially for her students at Western International University, South Mountain Community College, and other Phoenix-area institutions. Ms. Stapel has created many animations which supplement the lessons and highlight and clarify difficult concepts; a particular favorite is her "hand"​ animation explaining how to multiply two matrices: * How to Multiply Matrices * https://www.purplemath.com/modules/mtrxmult.htm * "hand"​ graphic: * https://www.purplemath.com/modules/matrices/hand_ani.gif Since 1998, when Ms. Stapel created her first personal web site for her student, Purplemath has steadily grown by about 30% a year. Access to the algebra lessons remains free to site visitors, with expenses paid largely by advertising and online tutoring. The Purplemath web site contains hundreds of pages of lessons and a free homework-help forum. Some trigonometry lessons have been added, and Ms. Stapel hopes soon to start expanding into elementary calculus topics. If you have software, services, or other resources which you would like to advertise on the Purplemath web site, please review Purplemath's advertising policies, and enquire. * Advertising on Purplemath * http://www.purplemath.com/advertise.htm * Contact Purplemath * http://www.purplemath.com/feedback.php Thank you for your interest in Purplemath! (Note: While Purplemath, Inc, has, from time to time, employed a few outside contractors for specific tasks, Purplemath has never had but the one owner or employee; namely, Elizabeth Stapel. Purplemath cannot provide references, job histories, or recommendations for any party other than Elizabeth Stapel. Claims to the contrary are made with neither the authorization, nor the consent, of either Elizabeth Stapel or Purplemath, Inc.)