The iPad app Octopus Planet 123 ($2.99) takes children ages three and up on a trip around the world. While on the trip, they learn about animals, habitat, and number systems. Children have fun as they take on comparing, taxonomy, sequence, matching, shapes, ordering, classifying, adding, and counting. The app is available in the iTunes Store in fifteen different languages.
Octopus Planet 123 LITE is free and offers a good way to try out the app.