This handbook provides distribution system operators thorough coverage of the common math problems they use daily and is designed for study for Certification testing. The four sections match the four (4) Grade Levels of Certification. Each section includes 100 math problems for that level followed by detailed solutions on how to work out each problem. There is also a 10 question test (with answers) at the end of each Chapter. Appendices cover common equations, conversation tables and formulas, units of measures, and a list of chemicals.