Definition of natural number, integer, rational number and real number

Rational number by nature 1 Classification by definition 2 Classification by Nature of Number

1 Classification by definition
{Integer:{ Positive,0, Negative Integer
Score:{ positive, negative
2 Classification by Nature of Number
{Positive rational number: positive integer, positive fraction
0
Fact: negative integer, negative fraction

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13. The inverse of a negative number is larger than itself; the inverse of a positive number is smaller than itself; any rational number has an inverse; the inverse of the inverse of -1 is 1.
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15. The following statements are incorrect:() A. Any rational number has a reciprocal B. The product of two reciprocal numbers is 1 C. Two reciprocal numbers D. Negative reciprocal of 1 and -1 The following statements are incorrect:() A. Any rational number has a reciprocal B. The product of two reciprocal numbers is 1 C. Two reciprocal numbers D.1 and -1 are negative reciprocal
16. Is a third a rational number? Is it true that infinite circular decimals are rational? Are two-thirds rational? The teacher said that all fractions and integers were rational If we figure out two-thirds, it's an infinite non-recurring decimal, and that's an irrational number? But when it comes to sorting, what are the two-thirds
17. The length of two sides of a right triangle is 3 and 4. Is the length of his third side a rational number? Could it be an irrational number? State your reasons.
18. Can a cube with a volume of 3 have an integer side length? Could it be a score? Could it be a rational number? Please state your reasons.
19. Is two-thirds a rational number, an integer, a fraction, a positive integer, a negative fraction, or a natural number?
20. Is 0 a rational number, an integer, a fraction, a positive integer, a negative integer, or a natural number?