Many people will be troubled by many problems since childhood. In particular, compulsory education is now implemented. People's expectations for knowledge are much higher than before. So we can get different knowledge at school. But people are different. Some people are naturally sensitive to different topics. For example, some people know nothing about mathematics. Some are geniuses. Xiao Lin has 25 stamps in her class. Xiaohong's stamps are four-fifths of Xiao Lin's. How many stamps does Xiao Hong have? This question is simple. Take Xiaolin's stamps as a whole, and then multiply them by the proportion to get the result we want. Xiaohong has 20 stamps.

Mathematics is an inseparable part of our life. Even if some people especially hate math, every aspect of life is related to them. Not only in class, but also the teacher said that addition, subtraction, multiplication and division will be used in later life. Even if you buy food, you don't have to be calculated by others. But in fact, mathematics is the potential driving force to promote the progress of the whole society. For example, we are the embodiment of mathematics in aerospace, infrastructure and account comparison. Our missile can take off and hit the target accurately, because scientists have mathematically deduced the exact position. We can lift a magnificent building from the ground, because the architect's drawings and designs are very reasonable. The comparison of accounts between companies can be accurate and not afraid of tracing, because there are silently dedicated workers behind them. Addition, subtraction, multiplication and division are just the foundation. Just like Xiao Lin and Xiao Hong's math problems. Without a similar education, it is impossible to know that Xiaohong has 20 stamps. This is also the charm of mathematics, which makes us know this wonderful world.

Many people are familiar with such a topic. But be careful. Any behemoth is accumulated bit by bit at the bottom. There are not only multiplication in mathematics, but also various complex operations, and the topic is very difficult. Xiao Lin's stamps are four fifths of Xiao Hong's. Then the little red chapter is redundant for Xiao Lin, because we have to divide the conditions here. Buy 30 stamps from Xiaolin. So even simple math problems, we have to do it right. In any exam and test, the most important thing is to score every bit. ? If you don't accumulate small streams, how can you become rivers and seas? ? .