1. In daily life, from weather forecast to stock fluctuation, mathematical description and analysis methods are everywhere. As a science that establishes the basic theory of scientific research, the development of mathematics has brought the development and progress of other natural sciences.

2. In primary schools, there are two main types of numbers: natural numbers and decimals. Decimals consist of integer parts, decimal parts and decimal points. Decimals can also be divided into: natural numbers refer to numbers representing the number of objects. Natural numbers are divided into even numbers and odd numbers according to whether they can be divisible by 2. Natural numbers can be divided into 0, 1, prime numbers and composite numbers according to the number of factors.

3. Mathematics is a discipline that studies quantitative relations and spatial graphics, which is basic and humanistic. Mathematics is a bright pearl in the sea of knowledge, which helps to enlighten wisdom, develop intelligence, cultivate innovative consciousness and improve practical ability.

Thales saw that people were reading the notice, so he went to check it. The initial notice said that Pharaoh wanted the smartest person in the world to measure the height of the pyramid. So I went to Pharaoh.

Pharaoh asked Thales what tools he used to measure the pyramids. Thales said he only used a stick and a ruler. He put the stick next to the pyramid. When the shadow of the stick was as long as the stick, he measured the length of the shadow of the pyramid and half the length of the bottom of the pyramid. Add these two lengths to get the height of the pyramid. Thales is really the smartest man in the world. He can easily measure the height of the pyramid without climbing to the top.

5. During the Warring States Period, Qi Weiwang and Tian Ji raced, and Qi Weiwang and Tian Ji each had three good horses: getting on, winning and dismounting. The race is divided into three times, and thousands of dollars are bet on each horse race. Because the horsepower of the two horses is almost the same, and Qi Weiwang's horse is better than Tian Ji's, most people think that Tian Ji will lose.

However, Tian Ji took the advice of his disciple Sun Bin (a famous strategist) and dismounted Qi Weiwang's horse, Ma Zhong of Qi Weiwang and Qi Weiwang. As a result, Tian Ji beat Qi Weiwang 2-/kloc-0-and won a lot of money. This is an example of China's ancient substitution game theory to solve problems.