This essays is about 111111 Most Useful and Common Rules in Mathematical Financial Laws. Applied Mathematical Finance is a branch of mathematics that deals with Finance Algebra methods that find use in finance, science, engineering, business, computer science, and industry as well. The successful Computational Finance Mathematician must learn, theoretical finance, mathematics, computational science, and application science. It is in bridging these disciplines that the Computational Finance Engineer will find greatest success. An expert in applied finance mathematics isn't just about crunching financial ratios. It's a career that uses mathematics to solve problems in the finance and Corporate Performance Management (CPM), which is famous in Computer Science. 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.