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All rational numbers can be written as one integer (the numerator) over another integer (the denominator).
If the numerator is less than the denominator, it is a vulgar (or common) fraction.
If the denominator is 1, then only the numerator may be written in which case it may take the form of a whole number, eg 5/1 can also be written as 5.
If the numerator equals the denominator, the fraction can be simplified to 1/1 which would be written as the whole number 1.
If the numerator is greater than the denominator, then it is an improper (or top heavy) fraction and can be written as a mixed number which is a whole number along with a proper fraction (with the original denominator), eg 5/3 can also be written as 12/3
The denominator can be any non-zero integer, ie zero is not allowed to be the denominator of any fraction.
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Which forms apair of equivalent rational number?
Equivalent fractions do.
Is a rational number always a rational number?
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Is the sum of a rational number and a rational number rational?
Yes.
Can you multiply an irrational number and a rational number to get a rational number?
Yes, but only if the rational number is 0.
Can a rational number be multiplied by an irrational number and equal a rational number?
Only if the rational number is 0.
