1, the definition of decimal point:

The decimal point is a mathematical symbol written as ".",which is used to separate the integer part from the decimal part in decimal system.

2. Definition of decimals:

Decimals consist of integer parts, decimal points and decimal parts. Decimals whose integer part is 0 are pure decimals; Decimals whose integer part is not 0 are called decimals.

3, the characteristics of the decimal point:

The decimal point is a demarcation point, with an integer part on the left and a decimal part on the right. The decimal point can be used to indicate the boundary between the integer part and the decimal part. For example, the ".5" in 1.5 is the decimal point, indicating the boundary between the integer part and the decimal part. At the same time, decimal points can also be used to indicate the accuracy of numbers. For example, in scientific calculation, the number of digits after the decimal point can indicate the accuracy of calculation.

Purpose of decimal point:

1, separating the integer part from the decimal part:

The decimal point is the dividing line between the integer part and the decimal part, so that we can clearly see the integer part and the decimal part of the number, which is convenient for us to calculate and understand the meaning of the number.

2, said accuracy:

Decimal point plays an important role in scientific calculation, which can indicate the precision of numbers, that is, the number of digits after decimal point can tell us the precision of numbers. In scientific research, the number of digits after the decimal point often represents the precision and accuracy of experiments. By observing the number of digits after the decimal point, we can know the accuracy and reliability of a number.

3, numerical conversion:

Decimal point plays an important role in digital conversion. It can convert a number from one system to another. By moving the position of the decimal point, we can easily complete this conversion, whether from binary to decimal or from decimal to hexadecimal. This makes the numerical conversion more simple and intuitive.

4, simplify the calculation:

Decimals can be used to simplify calculations. For example, addition and subtraction, aligning the decimal points can make the calculation easier and more convenient. In addition, in decimal multiplication and division, the position of decimal point can also help us calculate.