Pros
A great and fun place to work at if you enjoy working with kids. Mathnasium has it's own tutoring formula which you will receive plenty of training on. It's very easy to learn and helps organize the tutoring so that you do not have to come up with your own lesson plans. Mathnasium is a casual work environment and has a flexible work schedule (not the hours as much, but the days are flexible). Many kids that come to Mathnasium are very fun to teach, and you can even choose to play games with them as a reward for doing their work.
Cons
The pay is a little low at around $10.00 an hour for a tutoring job. However, the benefit is that you have a center to go to and lesson plans are made for you, so it's easier than being a private tutor. My only other complaint is that the training is a little lacking. You have to take a math test and score well to work here, so there's no need to train you in the math. But I would have liked to have more training in how to teach kids so they get it, since Mathnasium requires no prior tutoring experience, and I had none. Also some training in working with difficult kids would be helpful, though you can always ask your coworkers for help with that.