Thank you so much for putting these on every one of these! It's very helpful.
Unfortunately, for 7 and four you just gotta memorize it and hope you're right
Usually you can use the one you prefer, but in some things like the hour, days, age, etc you have to use a specific one. They are irregulars and you have to remember them.
Me too, because I always try to remember the anime by its original title!
しち and なな are both ways to say "seven".
つ however is always pronounced "tsu", never "zu".
Would 七つ not also mean seventh? As in seventh place or seventh day of the month?
Not necessarily. There is a specific counter for seventh day of the month, for example. And it is another irregular reading - なのか (seventh day or seven days)
So i remember "nana" is the original term duo taught us that means "7".
Also "mi" for ミつ happens to be the same exact katakana for "mi"
Any other relationships we can use to help memorize things?
Here are the readings for the general counter (1-10):
1 – 一つ (ひとつ) - hitotsu
2 – 二つ (ふたつ) - futatsu
3 – 三つ (みっつ) - mittsu
4 – 四つ (よっつ) - yottsu
5 – 五つ (いつつ) -itsutsu
6 – 六つ (むっつ) - muttsu
7 – 七つ (ななつ) - nanatsu
8 – 八つ (やっつ) - yattsu
9 – 九つ (ここのつ) - kokonotsu
10 – 十 (とお) - too
There are a lot of irregular or uncommon readings, so it is mostly straight memorization, no shortcuts. But once you have these memorized, it will make learning the counter for days and people easier, because there's a decent amount of overlap between these counters and the readings for some of the other common ones.
If you are wondering why these are so different, it is because this counter happens to use the less common kun readings for most of the kanji. Notice that the pronunciation of 四 (4) and 七 (7) look familiar, because you probably already learned both readings (shi or yon and shichi or nana). All the other numbers have (at least) two ways to say them, but you only learned the more common On reading.
Omg, the only one that I know of that doesn't sound completely different!
So when counting things, and you dont know what counter you should use, you can use tsu instead as a general counter for objects?