"It is 100 yen."
There's an AKB48 song that was helpful to me while learning the use of hyaku 百: "三百六十五日" (さん ひゃく ろく じゅう ご にち) or 365 days. It's really useful to try another numbers and there are a lot of Japanese songs with numbers in the lyrics. Music has been a very helpful tool to learn another languages to me.
In another sentence, it was necessary to put a 一 before a 万 (一万午百です), why here is it not necessary to put a 一 before the 百?
Japanese is using a 10000 repetition number system, it's just the way it is.
And so on and so forth
Thanks! That list is helpful. I really wish this lesson had started by mapping either hirigana or kanji to number meanings and then progressed to mapping hirigana to kanji.
Sorry, but I don't think that's correct. 10^5 is 100,000 but the Japanese number you wrote translates into 10,010. And your Japanese number for 1,000,000 translates into 10,100, etc. You got the order of the kanji wrong.
10^5 is 十万 . All the higher power of 10 replace "one" for the appropiate power increase. Like how 二十 is 20 while 十二 is 12.
This is why, when I was in Japan about 10 years ago, you'd see 百円や or 100 yen stores. Or basically a dollar store.