Three mathematical concepts are inherent to solving proportional equations. The first is algebraic operations, and using the same process on both sides of the parenthesis' expression. Other algebraic skills include cross-multiplication, division, and simplification of quantities. The second is an understanding of percent's and fractions, which can help visualize the proportions.
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mind and body FENCING help sharpen your mathematical skills.
You should keep learning - mathematical and other skills - throughout your life. Don't waste it!
There is no formula or equation for playing chess. It's called "skills" and "ability".
Equations are not especially useful for solving most of the real-life problems that people face, which is too bad, since problems that can be reduced to equations are likely to be solved before long if not immediately. However, there are many problems in the physical sciences and engineering that lend themselves to mathematical modeling and equations and modern computer allow many difficult computations to be made quickly. Statistical methods and computer simulations can solve problems where precise equations can not be found. Also, the mental discipline developed in learning any sort of mathematics will help you develop reasoning skills that will help you solve many real life problems in the future.
No, mathematics and writing skills are completely separate skill sets, most people are either good at one or the other, few are good at both. It's a good idea to work on your writing skills but in most math based jobs like accounting and engineering, you don't need writing skills as much as your mathematical skills.