When searching for material to practice big numbers for my interpreting training, I came across a fairly useful site called numerizer created by Anton Klevansky, who is a professional Russian conference interpreter member of AIIC. According to the the tool’s creator:
“Numerizer was designed for (future) interpreters and language learners by a professional interpreter with the aim of providing an unlimited source of challenging exercises, such as: jotting down every number in a sequence; shadowing (repeating after the speaker, first being just one number behind the original, then progressively trying to lag further behind); simultaneous or consecutive interpreting.”
Numerizer 1.0.2 beta has features that enable you to choose from several languages and accents, select the pace at which you would like to hear the rendering and set the amount of numbers to generate as well as the minimum and the maximum values.
The languages included are English US, English UK, German, French, Italian, Japanese, Polish, Portuguese, Russian, Chinese (Mandarin), and Chinese (Cantonese).
Note: there seems to be a glitch that does not allow you to set a minimum to a number smaller than 10 000 or a maximum over 999 999 999.
I hope you find this tool useful and have fun with your practice.