I wrote a small Android app for myself that has helped in my reading comprehension of numbers, in my case French numbers. Recently I put it up on the Google Play store so anyone can use it, and it's free of charge.
It's basically a number drill, something like flash cards, but with user-configurable speed, font and number format. The object is to say or think the number before the next one is shown. You can start with, say, two digit numbers every 5 seconds in a clear font, or make it difficult with phone numbers in a handwriting font.
The app will run in either English or French, d