This essays is about 111111 Most Useful and Common Rules in Mathematical Financial Laws. "Rocket science" in finance is a metaphor for activity carried out by specialised information technology staff to provide executive managers with the detailed output. Finance is not rocket science, unless it is government finance. Predicting and shaping financial future. As financial world become increasingly complex, demand has grown steadily for people who not only understand the complex mathematical models, but could also assuring the finance construction designed to implement complex contraints, making public listed firms to always get its optimum financial condition. They must work in the actuarial science and quantitative finance, as advance ment of Finacial Ratios and DuPont links. The nicest thing about it, is that only requires simple Junior Highschool Algebra. We just need to be consistent with its less number treatment of constellations. Its saddest part is that many professors and doctors are no longer able to understand Junior Highschool Algebra, and hiding in Accounting jargons.