What is Divisibility Rule of 9

In this video, we dive into the Divisibility Rule of 9, which allows for a quick and efficient way to check if a number is divisible by 9. According to this rule, a number is divisible by 9 if the sum of its digits is divisible by 9. For instance, the number 387 has a digit sum of 18 (3 + 8 + 7), and since 18 is divisible by 9, the original number is also divisible by 9. This method eliminates the need for long division, making it a useful tool for simplifying arithmetic problems.

The Divisibility Rule of 9 plays a key role in number theory, aiding in prime factorization, simplifying fractions, and solving puzzles or exams. By mastering this rule, you can speed up calculations and improve problem-solving efficiency. Whether working with large datasets or tackling mathematical challenges, understanding divisibility by 9 is fundamental for building a strong mathematical foundation and advancing to more complex concepts like GCD and LCM.

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