Hey -
I recently created an app that allows people to internalize and master numbers in their target language. I found that when learning Turkish, even though I knew the numbers, I couldn't actually understand them when spoken to me quickly. This led me to create a tool that would help me practice. It's called Foreign Numbers. It's available on iOS and Android now.
I'd love for you to check it out and give me any feedback that you might have! Or any tips/tricks you have for learning numbers in another language.
http://foreignnumbers.com
