ModMath

ModMath app (free and paid version) is a virtual graph paper that can be accessed either on an iOS (e.g. iPad/iPhone) or android devices. Students can use the touchscreen and keypad to set up and solve math problems without ever picking up a pencil. But in addition to basic math problems, Mod Math now handles complex algebraic equations too—from multiplication and long division to variables and quadratic equations. Dysgraphia affects kids with dyslexia, ADHD, autism, dyspraxia and other disabilities. Mod Math helps to level the playing field. 

Check out their website.