The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Power Math Apps:
Number Math App is for practicing basic elementary number facts. Its an easy to use and customizable application to enable focused learning. Some of the salient features are - Missing Numbers- Before After- Greater Than Less Than- Skip Counting- Rounding- Place Numbers in Ascending Order- Randomly generated problem cards - Simple Drag and Drop feature encourages kids to try- 4 different difficulty level - Simple sound effects to provide feedback Though kids can use it with minimal parent supervision, but some supervision and encouragement always helps them gain confidence and motivation. Really suitable for preschoolers, kindergarteners and also for some 1st gradersHappy Learning..