Round up for the number of sheets you'll need. Safe Gypsum dust can cause eye and respiratory irritation. Protect your eyes and lungs. Wear safety glasses and particle masks when appropriate and provide proper ventilation for the work site. Know your tools and use them only on jobs they were specifically designed to handle.
Dull tools are unsafe and can harm the work.
Always work with sharp cutting blades. Maintain your tools and always disconnect the power when working on a tool. Use caution when working from saw horses, scaffolding or ladders. Make sure the ladders' feet are secure on the ground. Never attempt to stretch while on a ladder.