Stack the States
This game asks questions about the states, capitals, nicknames, etc. and students have to select the right answer. This game is highly engaging! There's a free version at the App Store or another version for $0.99. P.S. There's also a Stack the Countries game!
Word Mess
This game has three ways to play and can be used to help students practice different skills at different levels of challenge. The first is to find all occurrences of a word in a certain time frame. The second is to find words that rhyme with a given word. The 3rd is to find words that fit a category. Word Mess is $0.99 at the App Store.
Chicken Coop Fractions
This game allows kids to practice estimating with fractions and decimal equivalents, fractions of a number, and improper fractions. It's multilevel with easy and hard games. It's also free at the App Store.