This single-page reference sheet introduces students to the fundamentals of binary code, including how binary (base-2) differs from the decimal (base-10) system students already know. It covers place values of binary digits (bits), how to convert small decimal numbers to binary and back, and how binary is used to represent data in computers. Key vocabulary such as bit, byte, and binary notation are clearly defined for quick reference. The sheet supports foundational computer science literacy aligned with middle school technology standards.