You can learn the mathematical model in life and use mathematics, because the mathematics learned in the first grade is relatively simple, so you can choose simpler ones.

1 If the sun shines, what is the appropriate distance between two houses, so that the first floor can be illuminated when there is sunshine, which is a very classic place.

There is also the problem of area. Given the same circumference, what shape do you usually take in your life to maximize the area (if it is good, it should be round)?

3. In life, when you buy something, you have a certain amount of money and want to buy a certain number and variety of things. Which combination will you use to make your money spend less and get the same effect?

In fact, there are still many places where mathematics is used in life. Probability, combination and so on are very useful.