和差问题是数学中的一种常见类型的问题，它需要我们在解决过程中进行加法和减法的操作。这类问题通常在小学低年级的数学课程中出现，因为它们能够培养学生进行简单计算的能力，同时也有助于他们发展逻辑思维和解决问题的能力。

The problem of addition and subtraction, also known as the "和差问题" in Chinese, is a common type of mathematical problem that requires us to perform addition and subtraction operations. These types of problems usually appear in the early years of primary school mathematics courses because they help develop students' ability to perform simple calculations and also enhance their logical thinking and problem-solving skills.