Elementary Brain Teaser

Fun and accessible problems for younger students or beginners. Posted every Monday, these weekly brain teasers kickstart your week with a mental warm-up.

Digit Detective

Posted: July 6, 2026

80 % of users got this correct

I am a three-digit positive integer.
My digits are all different.
My digits are all odd.
The sum of my digits is 15.
I am divisible by 3.
If my digits are arranged from greatest to least, the result is 396 greater than if my digits are arranged from least to greatest.
What is the greatest possible number I could be?

View Past Problems