An irrational number.
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The numbers which cannot be made into a fraction are the irrational numbers.
One fifth is a rational fraction. It is not a whole number and cannot be made into one.
13.2 is an improper fraction in decimal form. It is not a whole number and cannot be made into one.
42/90 is a proper fraction. It is not a whole number and cannot be made into one.
A mixed number needs to be made up of two parts: an integer (or whole) part and a fraction part. Since there must be a fraction part, it cannot be a whole number.