I decided to look up the answer. I was taught how to count in Japanese in a Judo class and we used "shi" and "shichi", as well. The short answer is that "shi" and "shichi" are use for counting and "yon" and "nana" and used when you want to say how much of something you have, e.g. four chickens or seven fish.
The way she says "nana" here is funny to me, because in my native language, "na" (না) means "no" and the way she says "nana" is the same intonation that someone would use in my language to say "no" while denying something vehemently, like, "did you eat the last cookie?" - "na na!" So whenever I have to deny something from now on, I'll say, "seven!" and confuse the hell out of people
In the manga Nana, they make a joke about how both main characters are named Nana, which means seven. Eventually, they start calling one Hachi, which means eight! She doesn't seem to like it all that much but goes along with it among friends that know them both. Great manga, by the way!
Japanese appears to have two number systems. One system which only goes from one to ten is best seen as a set of prefixes: hito, futa, mi, yo, itsu, mu, tsu, ya, kokono and to. They are frequently used with a -tsu ending, but in practical use the ending depends on the type of object being referred to. The other system is ichi, ni, san, shi, go, roku, shiji, hachi, ku and ju. This is the base for numbers of any magnitude.
Because "nana" is the romaji, its the pronunciation. it's not the translation. they were asking what it says in Japanese translated to English, so writing down the way it's said does not count as a translation since in English you don't say "one, two, three, four, five, six, nana, eight...".
These are the hiragana skills so they are more focused on teaching you how to read hiragana than counting
5 takes a special symbol called a dakuten introduced in Hiragana 4, ご "go". Since it is only a single kana though (and one already introduced just with the addition of a dakuten making it a voiced consonant), the contributors choose to use other words that allow them to cover more and newer material in the limited amount of space they have in the skill lessons. You will be introduced to the numbers more formally in the Time and Counting skills.
japanese has a pitch accent, so it does matter, this means that some syllables are high while others are low
i'm not sure if the intonation on here is correct but watch anime and pay attention to pitch to learn it (actually anime isn't that good for learning japanese but their pitch is still correct)
also this depends on the word, not the character
Yeah, but one can be used more than the other for different things. Such as for time, you use "shi-chi-ji" and "na-na-ji" for different contexts. I suggest looking into it more because im bad at explaining things so try finding articles or youtube videos that explain counters and when to use what numbers, so on and so forth.
There are at least two ways to say all of the numbers (a native Japanese reading and the Sino-Japanese reading), just the two ways of saying 7 (and 4) are more interchangeable than others. The different readings are covered more in the Time and Counting skills.
5 is ご "go"
These early skills are more about reading hiragana than learning to count. In Tree 4.0 voiced kana are not introduced until Hiragana 4, which also introduces the concept of small kana. Since dakuten and handakuten are just voiced versions of previously learned kana (ご go is a voiced こ ko) and there are other newer and more complicated things that need to be covered in that skill, the contributors opted to use more words that used small kana or a combination of voiced and small kana to explain more faster. It isn't necessary to go through the entire hiragana alphabet again for each voiced kana when they could just tell you "K -> G, H -> B/P" etc. The numbers are all more formally introduced in the Time skills.
In Tree 5.0 (Basics skills) Numbers 1-6 are introduced in Numbers 1 and 7-12 in Numbers 2
For me it just tells me do not lol https://gyazo.com/77b44f7f0143bb77d56b3ec1a074768f