1, the counting method of ancient Egypt more than 3000 years ago.
For example, 258 writing. This counting method is decimal, but there is no numerical system; As far as the above symbols are concerned, they can only represent 99999 at most, which is very troublesome to write. Now we can only use five symbols to represent the number 99999, but they use 45 symbols.
2. The ancient Greek counting system. The ancient Greeks' counting system was decimal, but there was no concept of value system.
They drew a bar on it with 27 ancient Greek letters α, β and γ to represent numbers. The first nine letters stand for 1-9, the middle nine letters stand for 10-90, and the last nine letters stand for 100-900. In this way, the largest number can only represent 999. In order to represent larger numbers, they introduced a new counting symbol. This counting system is very complicated, but because no numerical system is introduced, there is no guarantee that any large number has a corresponding symbol.
Ancient counting methods:
1, decimal counting method: The simplest counting method is to accumulate the single digits to 10, and then count from the beginning. This method was very common in ancient China.
2. Item counting method: This counting method is mainly based on the number of items. For example, bamboo sticks, beads and other items are used for counting, and each 10 item is tied with a rope.
3. Counting by solar terms: Ancient farmers in China often used this method to divide a year into 24 solar terms and count them according to different solar terms, so as to master the farming season.
4. limb counting method: this counting method is based on human limbs, such as fingers and toes. Ancient Europeans and Arabs counted with their fingers.
The above contents refer to Baidu Encyclopedia-Decimal System.