きゅうきょほう
九去法
1. casting out ninesMathematics
2. Casting out ninesCasting out nines is a sanity check to ensure that hand computations of sums, differences, products, and quotients of integers are correct. By looking at the digital roots of the inputs and outputs, the casting-out-nines method can help one check arithmetic calculations. The method is so simple that most schoolchildren can apply it without understanding its mathematical underpinnings.
Read “Casting out nines” on English Wikipedia
Read “九去法” on Japanese Wikipedia
Read “Casting out nines” on DBpedia
Read “Casting out nines” on English Wikipedia
Read “九去法” on Japanese Wikipedia
Read “Casting out nines” on DBpedia
九去法 【くきょほう】
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