Splash Math Grade 3 is an impressive app (both in scope and execution). The app covers more concepts than I can possibly review here, but the Study Pad site includes the entire list of items covered.
The main portion of the app is a set of questions that you can answer by clicking at the correct answer. This same concept is used for both practicing the concepts and testing the concepts. The app also has other areas like the aquarium where the student can buy fishes and crabs with the points that he/she won by completing the lessons. The concepts are taught adequately and with visual aide where appropriate. The app tracks progress, and can send reports.
The rest of the app is also very well done. The graphics are a combination of illustrations and what appear to be pictures of Origami animals. And the sound effects are not jarring.
Although the app is designed for third grade, it could be used for student at the end of second grade. And it can be also used in 4th to learn and practice a student’s weaknesses.
Overall a great app and a great study partner for a student in 3rd grade. Highly recommended. Study Pad, Inc makes similar apps for other grades. All apps are available for the iPhone and iPad (unfortunately no Android version). I tested on the iPad (provided for free by the publisher).