Modulo (Mod10) app for iPhone and iPad

According to an article on the New York Times, on national tests, nearly two-thirds of fourth graders and eighth graders are not proficient in math. Furthermore, A 2012 study comparing 16-to-65-year-olds in 20 countries found that Americans rank in the bottom five in numeracy.
The purpose of the application is to bring a game that will help its users with one of the most basic math skills—arithmetic—in hopes of helping users improve their math skills.
Modulo is a game that will challenge its players in performing quick arithmetic. The game consists of a 5 by 5 board filled with tiles. The goal of the user is to select adjacent tiles, and create as long as sequence as possible that gives a final sum equal to a multiple of ten.