"Arithmetic sequences" is the easiest way to learn and practice methods about arithmetic sequences.
The first part - I UNDERSTAND ! - shows definition and examples, calculation of any term and sum of first terms !
The second part - I TEST MYSELF ! - lets you experiment calculations with arithmetic sequences, including interests calculations.
Exercises are randomly generated, so every time you run the app, exercises and problems you have to solve are entirely new !
The app is also linked to Game center, so you can share your results and challenge your friends!