5. A fraction is _ a rational number.
6. A natural number is _ a whole number.

5.A rational number is a fraction where the top and bottom number (numerator and denominator) are integers, a general fraction can have real or complex number and even algebraic expressions as numerator or denominator.

6.Natural numbers are the set of positive integers, that is, integers from 1 to ∞ excluding fractional n decimal part. They are whole numbers excluding zero. Natural Numbers are also called counting numbers. Zero is the only whole number which is not a natural number. It is represented by 0

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