Over the years, if I was going to make a technological intervention in such a situation, it would include a laptop and accompanying software such as MathPad" from Intellitools. I have really found MathPad to be a great program for the right student. MathPad allows the user to solve arithmetic problems on-screen. The teacher can pre-load problems, which are presented individually. This program is both Mac and PC compatible, and retails for about $99.
More recently, a fellow OT shared with me the iPad app Mod Math by Division of Labor SF. This app is free, simple, and really intuitive to use.
ModMath is a great app for students who struggle with the writing process!The app removes the need for a keyboard, allowing the user to interact with program using the touch screen.
In an email conversation with their representative, Dawn, I learned that they are planning "to launch a kickstarter campaign to raise money for an update to Modmath that will allow students to use it for algebra". In addition they are also hoping to make a version for droid.
So, two great choices to help students whose writing is getting in the way of their math success. Happy therapy!