Question

is 4/43 a rational number

Answer 1

Rational numbers are, by definition, numbers that can be made by dividing two integers. Any number that can be expressed as a fraction is a rational number, for example

$0.5=\frac{1}{2}$

"0.5" can be expressed as the quotient between "1" and "2", so it is a rational number

The number "pi", for example, cannot be expressed as a fraction, so it is called an irrational number.

$\pi=3.1415926535\ldots\ldots$

The fraction:

$\frac{4}{43}$

Is the quotient between two whole numbers "4" and "43", so it can be considered a rational number.