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Divisibility Rules for 3 and 9

Website: https://math-stuff.com First, we list some numbers that are divisible by 3, and some that are divisible by 9. Then we notice that the same is true for the sum of their digits. For divisibility by 9, we can represent a number as the sum of two parts, where one part is divisible by 9, and the other part is the sum of its digits. Therefore, a number is divisible by 9 if the sum of its digits is divisible by 9. In the same way we can show for divisibility rule for 3: A number is divisible by 3 if the sum of its digits is divisible by 3. Image credit (Thumbs Up): Image https://pixabay.com/users/OpenClipart... by OpenClipart-Vectors https://pixabay.com/users/OpenClipart... from Pixabay https://pixabay.com/

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