Decimal division refers to the situation that the dividend or divisor contains decimal points in the division operation. For example, when calculating 0.8 ÷ 0.2, decimal division is needed. In this case, you need to move the decimal point to the end of the dividend and divisor, and then calculate by integer division. In this example, you can move the decimal point by one place to 8÷2, and the quotient is 4. Therefore, 0: 08 ÷ 0: 02 = 4.
We can see the specific steps of decimal division through this example. You need to determine the position of the decimal point, and then move the decimal point to the end of the dividend and divisor so that they are all integers. Then calculate according to the method of integer division, and the quotient is the final result.
Fractional division is not only a simple calculation method, but also widely used. For example, when shopping, you often need to calculate discounts. The discount price can be easily calculated by decimal division. In scientific experiments, it is also necessary to calculate the concentration or proportion by fractional division.
Decimal division in grade five is an important mathematical concept, which is widely used in people's daily life. By learning decimal division, we can better understand the relationship between numbers and solve practical problems.
Examples of decimal division in life
1. Cooking recipes: During cooking, the recipes may need to be adjusted according to the number of people. Suppose you want to cook a dish. The recipe says you need 2.5 kilograms of ingredients, but you only need to cook half of it. At this time, you can use fractional division to halve the weight of ingredients.
2. Calculate body mass index (BMI): BMI is a common method to evaluate health. Its calculation involves the ratio of height to weight. When people calculate the body mass index, they need to divide their weight (in kilograms) by the square of their height (in meters) by decimal division.