1. Financial management: Mathematics plays an important role in the financial management of individuals and enterprises. For example, the calculation of interest, return on investment, budget and financial analysis all require the use of mathematical knowledge.

2. Statistics: Statistics is a subject that studies data collection, analysis and interpretation, and it has applications in various fields. For example, clinical trial design in medical research, data analysis in market research and public opinion survey in government policy formulation all need statistical knowledge.

3. Engineering: Mathematics is widely used in engineering. For example, architects need to use geometry and trigonometry to calculate the size and structure of buildings; Electronic engineers need to use calculus and linear algebra to design and analyze circuits; Civil engineers need to use fluid mechanics and structural mechanics to solve the problems of water flow and load bearing.

4. Computer science: Computer science is a subject based on mathematics, involving algorithm design, cryptography, image processing, artificial intelligence and other fields. Mathematical knowledge is very important for understanding and solving problems in computer science.

5. Economics: Economics is a discipline that studies resource allocation and decision-making. It needs mathematical models and methods to explain economic phenomena and predict future trends. For example, the relationship between supply and demand, cost-benefit analysis, market equilibrium and so on all need mathematical knowledge.

In a word, mathematical knowledge is widely used in real life, almost permeating all fields. Whether it is financial management in personal life or data analysis in scientific research, it is inseparable from the support and guidance of mathematics.