Many, if not all, of these apps are available on Android as well as through iPhones/iPods/iPads, etc. Just go to your device’s store and search for them individually or by doing searches for specific areas (by “middle school math”, by grade, or by topic: Fractions, Multiplication, Proportions, etc.)
You could also search for areas of math in Google (or other search engine) and/or YouTube. There are all kinds of tutorials, games, and math help through our technological devices. There are even timed multiplication tests to help students get stronger in that one essential skill alone!