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Subcategories
Divisibility by 9
Proof of Trick for Divisibility by 9
Using the Trick
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Thanks so much!😊 👏 👏 👏 👏
Casting Out 9's
@professionalbronco Yeah! This trick makes finding remainders when dividing by 9 really fast. It's not too common that a problem will require you to find a number \(\pmod{9}\), but it's definitely very useful for this specific case.
Sum of the Digits of a Number Mod 3
Relationship of Remainders Mod 9 and Mod 3
Casting Out 3's
@neatlobster Please take a look at your other post where I answered your question. 🙂 https://forum.poshenloh.com/topic/707/question-what-does-it-mean-by-then-the-value-of-a-digit-in-its-place-is-exactly-the-sum-you-get-when-you-add-up-these-stray-1-s