In our daily life, we often encounter all kinds of mathematical problems, and estimation is one of the very practical mathematical skills. Estimation refers to replacing accurate values with approximate values in order to get an answer faster and more conveniently. In estimation, a common strategy is to take three digits as integer hundreds or integers, which is very effective when dealing with a large number of data.

First, let's look at an example. Suppose we need to calculate a three-digit addition problem, such as: 237+ 189. If we take 237 as an integer, that is, 200 and 189 as an integer, that is, 190, then the problem becomes 200+ 190. Now we just need to calculate the sum of 200 and 190, which is 390. Although this answer is not the exact value of 237+ 189, it is very close, and the calculation process is simpler and faster.

Similarly, if we need to estimate the price of a commodity, for example, a commodity worth 237 yuan is given a 15% discount, we can regard 237 as an integer, that is, if we take 200, the 8.5% discount can be about 20%, that is, 80%, then the estimated price is 200 × 0.8 = 160 yuan. Although this price is not accurate, it is close enough to the actual price, and the calculation process is simple.

In real life, we can also use this method to roughly estimate the data. For example, when counting the population, if the population of a city is 237,568, we can regard this figure as100000, that is, we can take 240,000 people, which can be estimated more quickly and facilitate the subsequent data analysis and processing.

Generally speaking, it is a very practical estimation strategy to regard three digits as integer hundred or integer. It can not only help us get answers faster when dealing with mathematical problems, but also help us quickly estimate all kinds of data in real life and improve our calculation efficiency and practical ability.