Is 77 ななじゅうなな or しちじゅうしち here?


One of the sentences I found in an online paper and put into my Anki deck is

77年前【ねんまえ】、原爆【げんばく】はなぜ長崎【ながさき】に落【お】とされたのか？

_Why was the atomic bomb dropped on Nagasaki 77 years ago?_

How is 77 read?

If I google ななじゅうなな, I get "About 1.730.000.000 results"

and Tae Kim says, "七十七 （ななじゅうなな）= 77"

<http://www.guidetojapanese.org/numbers.html>

However, a google search for しちじゅうしち produces "About 1.010.000.000 results"

and there is a bank called

株式会社七十七銀行（しちじゅうしちぎんこう、英: The 77 Bank, Ltd.）

[https://ja.wikipedia.org/wiki/七十七銀行](https://ja.wikipedia.org/wiki/%E4%B8%83%E5%8D%81%E4%B8%83%E9%8A%80%E8%A1%8C)

Can I just pick my favorite? Does it matter?




Both are fine. See the [Wikipedia/77](https://ja.wikipedia.org/wiki/77):

> 77（七十七、ななじゅうなな、ななじゅうしち、しちじゅうしち、ななそじあまりななつ）

Except ななそじあまりななつ, the other three could be used, but ななじゅうなな is the most
common.

しち is more for specific combinations (7月, 7時, etc.) or sounds a little dated.




Both are fine. See the [Wikipedia/77](https://ja.wikipedia.org/wiki/77):

> 77（七十七、ななじゅうなな、ななじゅうしち、しちじゅうしち、ななそじあまりななつ）

Except ななそじあまりななつ, the other three could be used, but ななじゅうなな is the most
common.

しち is more for specific combinations (7月, 7時, etc.) or sounds a little dated.

