Decimals in life are commodity prices. Vegetable prices, fruit prices, and commodity prices in the market are mostly decimal, such as Chinese cabbage 1.5 yuan has a catty of apples of 4.9 and a catty of toy cars of 9.9. The height of a person is 0.3 ~ 0.6m for infants, 0.2m for children and 0.7m for adults. Most people weigh in decimals, such as 59.8 kg and 73.4 kg. The current teaching will be 0.5 points worse. For example, Xiao Ming scored 97.5 points in the final exam of mathematics.

The meaning of decimal

The meaning of decimals divides a whole into 10, 100 and 1000, which are one tenth, one percent and one thousandth respectively, and can be expressed by decimals. One decimal place represents a few tenths, two decimal places represent a few percent, and three decimal places represent thousands. Add 0 or remove 0 after the decimal point, and the size of the decimal point remains the same.

The application of the basic properties of decimals We can use the properties of decimals to remove zeros behind decimals, and use the properties of decimals to rewrite decimals with equal size and more digits.