The following applet, created by [url=https://www.geogebra.org/u/orchiming]Anthony OR 柯志明[/url] (inspired by John Ulbright's applet "Adding Fractions - Visual" ([url=https://ggbm.at/szwBQ7wa]https://ggbm.at/szwBQ7wa[/url])), illustrates how to find the sum of two fractions.

The following applets can be found are by [b][i][url=https://www.geogebra.org/u/prof*math]Profs de math de la CSMV[/url][br][br][/i][/b]