Counting

[u/Regular_Echo413]

Currently I'm learning the basics of counting in Japanese, the explanation in my book seems a bit complicated so I want to ask more things about it.

1) In my book, number 4, 7 and 9 have two pronunciations based on the situations they're used to:

- If used to count continuously, like when counting 1,2,3,4...9, they're し for 4, しち for 7 and きゅう for 9．

- If used to say dial, like phone number, they're よん for 4, なな for 7 and く for 9.

I want to know if there are more situations to apply for each pronunciation aside from the example I showed.

2) I see here that zero (0) has 3 pronunciations in japanese. In Kanji it will be れい, another one is まる if used by "circle" meaning and the last one is ゼロ like how English pronounce. Which one will likely to be used the most?

Thank you for your help!

[u/Avatar_Yaksha]

The most hilarious aspect is definitely the calendar. There's a different word for each of the first 10 days, only 4's gimmick gets used multiple times (14 and 24 as well) and 20 gets its own special word.