How to write Arabic numerals 1 to 9?

Arabic numerals 1 to 9 are written in the grid near the left of Tian Zige, and 10-20 is used to fill in a Tian Zige;

Each number only takes up one day's grid, as shown in the figure below.

Arabic numerals are now commonly used in the world. It was first invented by Indians, then spread to Europe by Arabs, and then modernized by Europeans. Because the spread of Arabs has become the key node of such numbers, people call it "Arabic numerals" (it can also be said that people made a mistake and called it Arabic numerals by mistake).

Arabic numerals consist of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 * * * 10 counting symbols. Take the position value method, the high position is on the left, the low position is on the right, and the writing is from left to right. With the help of some simple mathematical symbols (decimal point, minus sign, percent sign, etc. ), this system can clearly represent all rational numbers. In order to express extremely large or extremely small numbers, people have created scientific notation on the basis of Arabic numerals.

In fact, Arabic numerals were not invented by Arabs, but by ancient Indians.