This document provides information about decimal and binary number systems including: 1) Tables that show decimal numbers and their equivalent binary representations from 0 to 15 and other examples up to 100. 2) Examples of converting between decimal and binary with steps shown for converting 1011, 100101, 13, 27, and 114 between the number systems. 3) Practice problems and solutions for adding, subtracting, and converting between decimal and binary.