Free · Number playground

Greatest Common Factor Finder for Kids

Find the biggest whole number that divides two numbers with nothing left over.

  • Clear, kid-friendly steps
  • Private in your browser
  • No signup

Number playground

Try your own numbers

Change the numbers, then press the button to see a clear answer.

Common-number answer

18and24

Greatest common factor: 6

This is the largest whole number that divides both numbers.

Powered by Fermat.ts, an open-source library available under MIT.

Three simple steps

How to use it

  1. Type one number, two numbers, or a short list.
  2. Press the big button to see the answer and a plain explanation.
  3. Copy the result, then try a new example.

Private by default

Your words and choices stay in this browser tab. There are no accounts, uploads, ads, or trackers inside the tool. Close the tab and the working data is gone.