The number "5". Two strokes. The first stroke is to write an oblique vertical line in the middle of the upper edge line of the upper right grid, and write a right semicircle where the horizontal dotted line intersects. The semicircle should be full, touching the right sideline and touching the lower sideline. The second stroke: start the stroke from an oblique vertical position, and write horizontally parallel to the upper edge line. Pay attention to writing flat, and stop writing when you reach the right edge line.

Data expansion

Arabic numerals (also called Indian numerals) consist of ten counting symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 * *. Arabic numerals were first invented by ancient Indians, then spread to Europe by Arabs, and then modernized by Europeans. People think it was invented by Arabs, so people call it "Arabic numerals".

Arabic numerals consist of ten counting symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 * *. 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 sci-tech books and periodicals, Arabic numerals are frequently used because of their simple strokes, scientific structure, clear images and few groups. Whether their use is correct and standardized is directly related to the quality of sci-tech periodicals.

Around the 8th century AD, Indian numerals (Arabic numerals) were introduced into China with the spread of Buddhism, but they were not accepted by the writing system in China at that time. From about 13 to 14 century, Arabic numerals were brought to China by Muslims, but they were also unsuccessful.

In the late Ming and early Qing Dynasties, China scholars began to translate a large number of western mathematical works, but all the Arabic numerals in the books were translated into chinese numerals. China first used Arabic numerals in the first year of Guangxu reign (1875), and imported Arabic numerals were introduced and used in the original version of mathematical writing.