There are many kinds of numbers, including odd number, even number, factor (divisor), sum number, prime number, even number, reciprocal number and so on. Judging from the riddle, the number of "5432 1" is arranged from big to small, so it can be inferred that it is a reciprocal mathematical term. After all, these figures are calculated backwards.

Reciprocal is a mathematical term, and pinyin is dào shù. Mathematically, it means that the product of a number x multiplied by it is 1, which is recorded as 1/x, and the process is "multiplication inverse". All numbers except 0 have reciprocal, and the numerator and denominator, in turn, are the reciprocal of 1, and 0 has no reciprocal. Obviously, the "five four three two one" series is the countdown.

Other riddles related to mathematics

1, riddle: One plus one is not two (type a word). The answer is "Wang".

Explanation: Combine the word "one", the plus sign "+"with another word "one" to get the word "Wang" instead of "two". So the answer is "Wang".

2. riddle: one MINUS one is not zero (type a word). The answer is "three"

Explanation: The word "one", minus sign "-"and another word "one" are combined to get the word "three" instead of "zero". So, the answer is "three".

3. Mystery: You are looking forward to me, and I am looking forward to you (using a mathematical noun). The answer is "equal".

Explain: "You are expecting me", you are waiting for me; "I'm expecting you" means I'm waiting for you. Two people waiting for each other is "equality". So, the answer is "equality".

4. Mystery: 765432 1(a mathematical term). The answer is "reciprocity".

Note: The usual number of newspaper reports is from small to large, just like the popular song "1234567, where is my friend". Now we say "765432 1", which is the reciprocal from the largest to the smallest, so the answer is "reciprocal".

5. riddle: seven out of eight (playing an idiom). The answer is "seven ups and eight downs".

Explanation: "Eight-sevenths" is written in mathematical symbols, with the number 7 written above the fractional line and 8 written below the fractional line. The answer is the idiom "seven ups and eight downs".