Grammar detail: 10分

10分  じっぷん or じゅっぷん?
211 words
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Traditionally, multiples of 10 minutes were all pronounced じっぷん, not what you might expect, じゅっぷん. The historical reason for this is that 10 minutes is written with kanji as 十分, and while the character 十 counts じっ as an official reading, it does not have じゅっ. In other words, that kanji combination can't officially be read as じゅっぷん.
This is in fact still true today: the official Japanese government document
is the primary arbiter of what are considered 'standard' readings for Joyo kanji. For 十, it has four: ジュウ, シュウ, ジッ and と, which interestingly does not include とお, the reading used in the very common word
Increasingly, 十 is not written in kanji, but using numerals - 10 or 10. This is perhaps partly to distinguish '10 minutes' from じゅうぶん (enough), which is also written in kanji as 十分. More likely it is just that numerals are more concise than kanji for writing numbers, and are gradually taking over.
Whatever the reason, the word じゅっぷん is increasingly common in daily use, and is certainly not considered incorrect. It is even encountered in many modern textbooks. It's safe to say that it's gradually becoming the standard, and very possibly a near future edition of the 常用漢字表 may reflect that.
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Kanji used in this grammar

ジュウ   ジッ   と    とお ten   
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ブン   ブ   フン   わける to divide, to distinguish   わかる to understand   わかれる to be divided   わかつ to share, distribute   
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ジョウ   つね usual, normal   とこ- endless, unchanging   
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ヨウ   もちいる to use   
カン    Chinese   
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ジ   character   あざ village section   
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ヒョウ   おもて surface, front   あらわ to show, to represent   あらわれる to be present, to appear   
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ニチ   ジツ   sun; day   ひ    -か    
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