This book was written at the request of nurse educators and with considerable help from them. It deals with elements of the arithmetic of nursing, especially the arithmetic of basic pharmacology. The book begins with a diagnostic test which is carefully related to a set of review exercises in basic arithmetic. Answers to the test are supplied at the back of the book and are keyed to the corresponding review exercises. Students should work through those exercises which correspond to errors in the diagnostic test. The other exercises may also, of course, be worked through to improve speed and accuracy. Throughout the other chapters of the book there are adequate, well graded exercise and problems. Each chapter includes several worked examples. Answers are given to all questions.