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Here's an example sentence from 北斗の拳 which uses a fair amount of furigana
throughout.

> xxxに残された命は三日...

Which includes furigana for のこ, いのち, and, bafflingly, even the か of 日, but
none for 三. While I already know that 三日 is みっか, there are plenty of other
words with numbers that are beyond me. I'm sure I'm not the only student
frustrated by this practice. What's the reasoning, if any, for this?
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kanji numbers spelling furigana
Why are furigana for number kanji almost always omitted?
The number kanji are included on the list of [first grade
kanji](http://en.wikipedia.org/wiki/Ky%C5%8Diku_kanji#First_grade_.2880_kanji.29)
that all Japanese children, theoretically, should know by they are in the
second grade of elementary school. The other kanji you list (except for 日, but
they may not cover that reading) are at higher reading levels. It's likely
that they made an editorial decision that, well, pretty much any child who
knows the kana well enough to read them fluently is going to know the number
kanji at least. The other kanji in grade one - well, they may know the kanji
itself, but not necessarily the compound it's in, so I wouldn't be surprised
if they furigana'd those as well.
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2011-06-03T01:45:58.873
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This is similar with bdonlan's answer, but in my understanding,

On first grade, they learned both 三, and 日 kanjis, but only pronounced 日 as
"ひ" in "Sun", but not as "か", and also there is some probability that no 日付
related terms learn on first grade like ついたち「一日」、ふつか「二日」、みっか「三日」, ... yet.

So, may be that's the reason why they only put ふりがな on 日, but not on 三.
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2011-06-03T03:02:14.313
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