1. Shopping calculation: We often need to calculate the price, discount and tax of goods, and mathematical knowledge can help us to make accurate calculations.

2. Time management: We need to arrange our time reasonably to complete various tasks. Mathematical knowledge can help us calculate time interval, speed and distance, so as to manage time better.

3. Cooking and recipes: In the cooking process, we need to measure the weight, capacity and temperature of ingredients, and mathematical knowledge can help us to make accurate measurements and calculations.

4. Travel planning: During the trip, we need to calculate the distance, time and cost of the trip. Mathematical knowledge can help us make a reasonable plan and budget.

5. Financial management: We need to calculate interest, investment return and loan repayment, and mathematical knowledge can help us make accurate calculations and decisions.

6. Health management: We need to calculate body mass index (BMI), heart rate and blood pressure. Mathematical knowledge can help us understand our health and take corresponding measures.

7. Transportation: We need to calculate the speed, fuel consumption and driving distance. Mathematical knowledge can help us choose the best way and route to travel.

In a word, mathematical knowledge is widely used in daily life, and plays an important role in shopping, time management, cooking, travel planning, financial management, health management, transportation and so on. By applying mathematical knowledge, we can make more accurate calculations and decisions, and improve the efficiency and quality of life.