You don't mention the age of the child, but among the tablets you might want to consider are: InnoTab by V-Tech, LeapPad by LeapFrog, Nabi 7, Xoom Family Edition, Nook or PlayBase.
The best online retailer for learning tablets is amazon. They have a vast number of tablets available from different brands. Prices range from 10 to 50 although cheaper and more expensive models are available.
I found the best advice at fun.familyeducation.com. They feature all the different tablets and have reviews for each on the educational value that your child can get from owning a tablet.
Children's tablets are different from regular tablets in that they offer downloadable content specifically for kids. This includes games, books, and learning apps.
Learning tablets are available for kids of all ages now. For example the Leap Pad, which is a very popular tablet like device for younger children is recommended for age 3 and up.
Some of the positively-reviewed tablets at the moment include: Leapfrog LeapPad Ultra, Nabi 2, VTech InnoTab 2, Leapfrog LeapPad 2 and the Barnes & Noble Nook HD.
The best learning games for someone who is struggling in math are available on Funbrain.com. They have some great games for kids of all ages to learn math.
For an age of seven years old, after doing some research it looks like the best tablet for a child of that age would have to be a tablet from either VTech or LeapFrog. Those companies design tablets specifically for young children around that age group which would provide them the skills to be able to use and operate more advanced tablets, such as Android tablets or Apple iPads, when they get older.
I think vtech is the company that makes the best learning games for kids. Also it is the brand that has very good prices toy compare to other company too .
The best place to download learning games for kids online is website, such as OneOnlineGames where someone is able to dowload many good games for kids for free.
Best places online to buy learning games for kids can be found on amazon where multiple user reviews and ratings give a more detailed look into the types of games.
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If you are looking for some of the best learning games for kids, you can find them online or visit stores in person. Stores such as Toys R Us and Amazon sell them. However, you can sometimes find free games online at websites such as thekidzpage.