school Kit math app
This app has several Math tools that you may have already used such as hundreds chart, number lines, number houses for Math facts, and more. It is free and only needs iOS 8.1. Students can interact with the tools to gain a better understanding of the Math concept you're working on in class.
fry words app
The Fry Words app has all the Fry sight words divided into groups of 10. When using this with a student or group you can click on the star at the top left-hand corner for words that need to be reviewed more. It creates a special list of the words that need more review. The other neat thing about this app is that you can create your own list of sight words for the students to review.