A horizontal line in the middle of the concept score of mathematical fractional line is called fractional line, the number above the fractional line is called numerator, and the number below the fractional line is called denominator. Sometimes it is a slash "/",with numerator on the left and denominator on the right. In a sense, the fractional line is equal to the division symbol and the comparison symbol. The numerator is the dividend and the denominator is the divisor; The numerator is on the left of the comparison symbol and the denominator is on the right.
Reference: Leonardo of Pisa, also known as Fibonacci (1 175-1250), an Italian mathematician, first studied Fibonacci numbers in the west, and introduced the modern system of writing numbers and multiplying digital values into Europe. And the founder of the fractional line.
What is a fractional line? The horizontal line in the middle of the fractional line is called the fractional line, the number above the fractional line is called the numerator, and the number below the fractional line is called the denominator. Read it as a score.
Fractions can be expressed by the division formula: for example, half equals 1 divided by 2. Where 1 numerator is equal to dividend,-fractional line is equal to divisor, denominator of 2 is equal to divisor, and 0.5 fractional value is equal to quotient.
Scores can also be expressed as ratios, for example; Half is equal to 1: 2, where 1 numerator is equal to the previous paragraph,-the fractional line is equal to the comparison number, the denominator of 2 is equal to the latter term, and the value of 0.5 points is equal to the ratio. The basic nature of a fraction: the numerator and denominator of a fraction are multiplied or divided by the same non-zero number, and the obtained fraction is equal to the original fraction.
The origin and history of fractions have to start from Egypt more than 3000 years ago.
More than 3,000 years ago, ancient Egypt used special symbols to indicate the fraction of a molecule as 1 in order to represent an undivided number. China had scores more than two thousand years ago, but the forms of scores in Qin and Han Dynasties were different. There is a fractional representation system in India similar to that in China. Later, Arabs invented the fractional line, and today's fractional expression also came from it.
More than 200 years ago, the Swiss mathematician Euler said in his book General Arithmetic that it is impossible to divide a 7-meter-long rope into three equal parts because there is no suitable number to represent it. If we divide it into three equal parts, each part is 7/3 meters. Like 3/7 is a new number, which we call a fraction.
Why is it called a score? The name score shows the characteristics of this number intuitively and vividly. For example, a watermelon is divided equally among four people. Why not divide it into four equal parts? As can be seen from this example, the score is generated by the need of measurement and mathematics itself-the need of division operation.
Why are fractions called numerator and denominator? The so-called fraction is to divide the numbers, so the number above the fractional line becomes one of many equal parts, and the number below represents an integer. Now let's see why the above question is called "molecule", which involves "fractional unit". When you divide a number into several equal parts, one of them is one tenth, which is a decimal unit. Only when the numbers above and below the fractional line are equal, the value of the fractional line will be equal to 1, otherwise it will be less than 1. Because the number above the fractional line is usually smaller than the number below, it is easy to understand. The small number above is called "child" and the big number below is called "mother".