2. "-"was also created by Wei Demei. Subtracting a vertical bar from the plus sign indicates a decrease.
3. "×" was first used by American mathematician Audrey in18th century. It means another way to increase, so write the plus sign on the diagonal.
4. "⊙" was created by Swiss Hannah in18th century. It means decomposition, separating two points with a horizontal line.
5. The number "=" was invented by16th century British scholar Colder.
Extended data
Mathematical symbolization allows people to express mathematical ideas in an agreed and standardized form. It expresses information in condensed form, thus accelerating the speed of mathematical thinking and promoting the development of mathematics. To do a good job in teaching common mathematical symbols, we must do the following work.
1, the key to the correct use of mathematical symbols is to let students understand the meaning and essence of mathematical symbols. The concept of teaching itself is abstract, and mathematical symbols are often the representatives of mathematical concepts. Therefore, it is necessary to understand the meaning and essence of each teaching symbol.
Only by strictly observing the writing rules of mathematical symbols can we develop a good habit of being meticulous; The mathematical symbol system in an expression should be unified; Let students observe the writing habits of symbols' case, and don't write common mathematical symbols too big or too small or different from general writing.
2. Make students clear the meaning and essence of symbolic thinking. We should realize that mathematical language is used all the time in mathematics teaching, and it will be used in the communication between teachers and students and in the communication and cooperation between students. Therefore, teachers need to inspire students to transform "mathematical problems" into mathematical language, so that students can have a more complete and thorough understanding of mathematical symbol thinking and specific mathematical symbols and can use it to solve problems.
Baidu encyclopedia-arithmetic symbols