17 Apps that Take the Trouble out of Travel

There are dozens of math-focused apps available, but our preference tends towards Motion Math: Hungry Fish for its visual manipulation of addition, subtraction and negatives. As the numbers pop onto the screen, drag them together to make the required total. In the highest levels of difficulty (the Caves), there's only one chance to get it right before the Mad Fish eats your wrong answers. This game has relatively simple graphics compared to some games, but they'll be concentrating too hard to figure (ha!) that out.