1. Financial management: Mathematics plays an important role in the financial management of individuals and enterprises. Such as calculating interest, investment return, loan interest, etc. Everyone needs to use mathematical knowledge.

2. Shopping and trading: When shopping, we need to calculate prices, discounts, taxes, etc. When trading, we may need to calculate exchange rate, stock price fluctuation and so on.

3. Measurement and architecture: In the field of measurement and architecture, mathematics is essential. For example, we should use mathematical knowledge to measure the land area and calculate the height and volume of buildings.

4. Transportation and navigation: Mathematics also plays an important role in transportation and navigation systems. For example, mathematical methods are needed to calculate the shortest path, speed and distance.

5. Communication and network: In the field of communication and network, mathematics is widely used in data coding, encryption and compression.

6. Medicine and Biology: In medical and biological research, mathematics is used to simulate biological systems, analyze data and predict the development of diseases.

7. Engineering and technology: In the field of engineering and technology, mathematics is widely used in design, modeling and optimization.

In a word, mathematics is widely used in daily life, covering almost every field. By applying mathematical knowledge, we can better understand and solve practical problems.