Given an integer, sum the digits repeatedly until you end up with a single value less than 10.

For example, if you add the digits of the number 123456789, you get 1+2+3+4+5+6+7+8+9 = 45, and then 4+5 = 9

The input will be a string of digits. The output should be the scalar value of the repeated sum of digits.

Solve

Solution Stats

1024 Solutions

301 Solvers

Last Solution submitted on May 29, 2026

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers301

Anne Adamczyk Matthew Bolyard Garrett Lorenzo

Suggested Problems

More from this Author3

Problem Tags

Community Treasure Hunt

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

Start Hunting!