Casting 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 more about Casting Out Nines: Examples, How It Works, A Variation On The Explanation, History, References in Popular Culture
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“For the gods, though slow to see, see well, whenever a man casting aside worship turns folly.”
—Sophocles (497–406/5 B.C.)