I always round down to the nearest hundred, so in this case I would trade 300 shares. It is better to error on the side of conservative. This will be perhaps the most important section of the course because it covers not going broke. The real business of a trader is to stay in business. We are not in the get rich quick business.
Trading is a professional occupation, much like being a doctor, attorney or engineer.
As such is must be approached in a professional manner. That means using proper risk control and money management. Proper Money Management and Risk Control means never putting yourself in a position that one bad trade, or even a series of 10, will put you out of business. Remember, your primary business objective must be to stay in business. A proper Money Management component to your business plan not only assures your longevity simply by not allowing obscenely large positions, but also by removing significant psychological barriers in trading.