Math Practice Flash Cards is a free Android App from TeachersParadise.com. The app designed for elementary school students. As the name implies, Math Practice Flash Cards is a set of flashcards for practicing addition, subtraction, multiplication, and division. The app allows you to use pre-made sets of flashcards or create your own set of flashcards. To create your own set of flashcards just choose the parameters of largest numbers and smallest numbers in the flashcard set. You also have the option to choose from "fun" mode which is not timed or the timed mode.
I gave Math Practice Flash Cards a try on both my Samsung Galaxy Tablet and my Motorola Photon. The app does not appear to be optimized for tablets yet, but it does work very well on my phone.
Applications for Education
Math Practice Flash Cards could be a nice way for kids to practice mental math calculations wherever they are.