24 点作者 fargo超过 9 年前

3 条评论

hcase超过 9 年前

that is one of the most poorly written wikipedia articles i have ever read

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cproctor超过 9 年前

How is this different from "casting out tens," or just checking the accuracy of the digit in the ones place?

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fibo超过 9 年前

In Italy you learn it at 8 years old. It is also said, "cast out nines" instead of "double check".

Casting out nines