First, the meaning is different.
"Ji" is a mathematical quantifier for numbers, such as several puppies and apples. "Which number" is a method of numbering a series of mathematical symbols and figures in a specific order, such as first, second and third.
Second, the expression is different.
"Ji" usually means any number of mathematical quantifiers, such as "How many biscuits are there" and "How many balloons are there". And "which number" is a method of giving a starting point in a specific order and numbering a series of mathematical symbols and figures with numbers, such as "fifth" and "eleventh".
Third, the scope of application is different
Mathematical quantifier "Ji" has a wide range of applications in mathematics, such as series and inequality. And "which number" is mainly used to number specific objects or things, such as ranking certain things or people and so on.
Fourth, examples.
For example, there are five children in a row, so the third child from left to right is "third" or "third"; And if there are five children playing in the room, then there are "several children playing", where "several" refers to any number.
For example, if there is a square with a side length of 10 cm, its circumference is 4× 10=40 cm, where "4×" means multiplication, not "which number".
"Pole" and "Pole" are very important concepts in first-grade mathematics, and there are obvious differences in mathematics application.
First of all, "several" usually means an uncertain quantity. It can be used to ask questions or describe quantities. For example, "How many cookies do you have?" Or "How many books do you have?" This uncertainty may come from the fuzziness of the problem or from the general mention in the description.
"Which number" is more inclined to the concept of position or order. It usually describes the relative position of a specific element in an ordered set. For example, "What day is it today?" Or "where is he in the class?" This refers to the position or order, not the quantity.
The main difference between them is that "Ji" means quantity and "Ji" means position or order. In practical mathematical application, this difference is very critical. It is an important step for junior one students to correctly understand and apply these two concepts in mathematics learning.
Generally speaking, although "Ji" and "Di Ji" are both mathematical quantifiers, their usages are different in different situations. Therefore, when learning first-year mathematics, we should combine specific situations and examples to understand their differences and applications.