This essays is about 111111 Most Useful and Common Rules in Mathematical Financial Laws. In investment decisions, synthesizing the financial measure requirements (quantitative construction), should be the most important element in the fundamental financial healthiness. The massive amount of numbers in a company's financial statements must not be bewildered and should never intimidating sincere investors. However, through financial ratio synthesis, we must be able to work with these numbers as a "healthy financial blue print." Fundamental financial ratio analysis is fundamental (important) but just be the basement of the financial skyscraper. To build a strong financial structure, we need to do the financial synthesis to construct our far more advanced financial high structures.