Paradise tutoring... Well, I'm down to two kids (from three): Sarah had to drop out because she's already got too heavy a load. Her mom listed all that she's got, and I have to agree – that slip of a girl has way too much on her plate. So now I've got Nicholas (11 years old, 4th grade, budding robotics engineer) and Abby (around 13 years old, I think in 7th grade, budding scientist).
Both of them did fairly well on their homework. The concept of tens-complement arithmetic had escaped them, and decimal-to-binary conversions as well, so we worked on them for a while. Then I gave them a concentrated hour on twos-complement arithmetic and the basic binary operators (inversion, addition, AND, OR, and XOR). Their homework has some hard problems on it; it will be interesting to see how they do :)
Each time Abby got the idea about how something worked, you could see her light right up – she gets joy from understanding. That's why I called her a budding scientist :)