A father-son-son team is behind mathematics learner MATH 42, which aims to help kids in fifth through twelfth grades engage and get better in the subject.

It takes math problems and creates a path to easy-to-follow solutions by underscoring the steps. It has calculator functionality, integrated textbook, tests, and assignment management. It constructs graphs, and material can be shared.

The app made Apple’s 2013 Most Innovative Learning Apps.

MATH 42 costs $0.99 on the App Store, and the developers are quick to note that there are no extra in-app purchases.