This simple step just bring them as finalist in Lomba Karya Ilmiah Remaja in Indonesia. Most student, specially in elementary school having much proble in math. While they used to call Calculator apps in their celular phone. So this is the best combination with phones, apps and learning process.
This app produce with Corel Draw X3, Adobe Photoshop CS3 and Macromedia Flash Professional 8. It running on Symbian IV or any other device with flash lite supported, like Nokia 3230, Nokia E63 or Nokia Express Music.