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The jsMath package provides a method of including mathematics in HTML pages that works across multiple browsers under Windows, Macintosh OS X, Linux and other flavors of unix. It overcomes a number of the shortcomings of the traditional method of using images to represent mathematics: jsMath uses native fonts, so they resize when you change the size of the text in your browser, they print at the full resolution of your printer, and you don't have to wait for dozens of images to be downloaded in order to see the mathematics in a web page. There are also advantages for web-page authors, as there is no need to preprocess your web pages to generate any images, and the mathematics is entered in TeX form, so it is easy to create and maintain your web pages.

teachers can set time and complexity of practice - not much output for engagement

Google directory of Math practice sites with activites appropriate for teen-age users

use of number line for interactive practice, requires mouse precision, limited multi-sensory feedback, adjustable levels

age appropriate facts practice for older users but requires good visual-motor skills for answering and visually very busy

Addition, Subtraction, Multiplication and Division