I don't have a tablet, but I have an android phone, so I'm assuming the same sort of apps work on both. These are some that my kids like (they're 10 and 12, so they're a little older than yours, but I think these are all pretty good)
Angry Birds
Minecraft
Doodle Bowling
Fruit Ninja
Yahtzee
Jewels
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--Glynis
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