According to the topic information, there are 38 calligraphy groups. This is a known exact number.
It is known that the Lego group has four fewer people than the calligraphy group. This is a relative quantitative relationship. You can calculate the number of Lego teams by subtraction. Subtraction is one of the basic operations in mathematics, which is used to find the difference between two numbers. Here it can be expressed as: Lego group number = calligraphy group number -4. According to this formula, we can know that the number of Lego teams is 38-4=34.
In order to get the total number of people in the two groups, we only need to add up the number of people in the calligraphy group and Lego group. This is the application of addition operation, which is one of the basic operations in mathematics. Total = number of calligraphy groups+number of Lego groups. According to this formula, we can draw that the total number of people is 38+34=72.
There are 72 people in the calligraphy group and Lego group of Hongqi Primary School.
The application of basic mathematical operations in daily life;
1. Whether it is to calculate the price when shopping, calculate the travel time when planning a trip, or make statistical analysis when studying scientific data, it is inseparable from mathematical operations.
2. Addition and subtraction are the most basic mathematical operations. When shopping, we often need to add to calculate the total price of purchased goods, and subtraction can help us calculate discounts or change. Addition and subtraction are also essential in financial activities such as calculating wages or pensions.
3. Multiplication and division also have many applications in daily life. For example, when calculating interest rates or percentages, we often need to use multiplication and division. Multiplication and division are also commonly used methods in statistics and data analysis.
4. Scores and percentages are also common in daily life. For example, on the nutrition label of food, we will see the contents of nutrients such as fat and carbohydrate, which are expressed by scores or percentages.