Problem 42411. Divisible by 9

Pursuant to the first problem in this series, this one involves checking for divisibility by 9.

Write a function to determine if a number is divisible by 9. This can be done by the following method:

  1. Sum the digits of the number. As with methods for other numbers, this summing step can be applied recursively until a single-digit number results. If the resulting number is divisible by nine, then so is the original number.

Previous problem: divisible by 8. Next problem: divisible by 10.

Solve

Solution Stats

62.34% Correct | 37.66% Incorrect
Last Solution submitted on Nov 23, 2025

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers270

Suggested Problems

More from this Author139

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!