There is another way to practice reading numbers in Cantonese. It is to memorize the multiplication table. As I said in the video, it is a secret of why Chinese people calculate so fast. If you are familiar with the table, you can treat multiplication as addition.
For example, 87*56, you can treat it as addition of 350+4000+42+480.
Multiplication Table in Cantonese 乘數表
This is a song I composed after watching a Thai movie. Speaking Cantonese is just like singing a song. I matched the “tone” of numbers with the musical notes. Then it became a song. Although the song’s melody is not good, up to now (almost a year) when I sing this song, I can still remember all the 53 decimal numbers of Pi, 3.141592653589793238462643383279502884197169399 37510582 …..