At first, people only used words to represent decimals It was not until the13rd century that people used lower grids, such as 8.23 notation, where the left side represents the integer part and the lower right side represents the decimal part.
In ancient times, some people memorized decimals by circling each number in the decimal part. For example, 1.5 is recorded as 1⑤, and this circle separates the integer part from the decimal part. This symbol was later spread to Central Asia and Europe.
In A.D. 1427, Al Cassie, a mathematician in Central Asia, created a new decimal notation. He records decimals by separating integer parts from decimal parts, for example, 3. 14 is 3. 14.
/kloc-in the 0 th and 6 th centuries, Europeans attached importance to the role of decimals. In Europe, some people recorded decimals like this at that time. For example, 3. 14 15 is 3 ⊙115 ⑤. ⊙ can be regarded as the boundary symbol of the integer part, and the numbers in the circle represent the order of the digits. This notation is interesting, but it is very troublesome.
Until 1592, the Swiss mathematician Bhurki made great improvements in the representation of decimals. He uses a small circle to separate the integer part from the decimal part, such as 5. 24 ... The small circle in the number actually acts as a decimal point.
After a while, German mathematician kravis replaced small circles with small black dots. So the writing of decimals has become our present representation.
However, in different countries, the way of decimal representation is different. Now, there are two ways to write the decimal point: one is to use ","; One is to use small black dots.
In Germany, France and other countries, ","is often used to write decimals, such as 3,42,7,565,438+0 ..., while some countries in Britain and Northern Europe use "."to represent decimal points, such as 65,438+0.3,4.5. ...