1, from high to low, read step by step, the zero at the end of each stage is not read, and only one zero is read for the remaining digits; How to write integers: write from high to low step by step. If there is no unit on any number, write 0 on that number.

2. Reading is to express numbers in words, such as 1203.4. Reading is to write a number 1203.4, which means to represent a number with numbers and symbols. Such as: 1 12.5. For example, 1203.4 should be read as: 1203.4, that is, read from the highest bit 1, write from the highest bit 1, and write from high to low.

3, the law of writing numbers: starting from the high position, write in numerical order. Write on thousands, on hundreds, on tens, on tens. If there is no one in the middle or at the end, write 0 on that bit.

4. Rules of reading: read from a high position in numerical order. A thousand people study a thousand people, a hundred people study a hundred people, ten people study dozens of people, and a few people study a few. There is a zero or several zeros in the middle, and zero is read-only; No matter how many zeros there are at the end, don't read them.

The benefits of learning mathematics

People who are good at math are relatively smart and savvy, and they can show their advantages in dealing with people. The faster you think, the more ways and ideas you have. Cambridge, majoring in financial mathematics at Carnegie Mellon University in the United States, said that studying mathematics has brought her mental exercise and made me pay more attention to the rigor of thinking in my life.

Can manage money better than others. The application of mathematics in life is everywhere. Nowadays, the society is already an information society, and mathematical knowledge is used in financial management and computers. Warren Buffett is very powerful, but Buffett's power is also based on mathematics. Buffett's decision-making process is actually the method of using subjective probability.