A rational number is any number that can be expressed as a ratio of two integers, p and q in the form p/q where q>0.
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A rational number is any number that can also be expressed as a fraction.
Any number that is presented as an integer "over" (aka divided by) an integer is automatically a rational number - that's what the definition of a rational number is.
1.2073
Yes, 0.3 is a rational, for it can be written as a fraction. By definition, rational numbers are any numbers that can written as a fraction.
example the rational approximation of pi is 3.14 so a rational approximation is shortening a really long number so it can be written out