A mixed number, by definition, has a magnitude greater than 1.
A proper fraction, by definition, has a magnitude less than 1.
A mixed number can never be expressed as a proper fraction, or vice versa, because a mixed number and a proper fraction cannot have the same value. A number greater than 1 will never have the same value as a number less than 1.
A proper fraction, by definition, has a magnitude less than 1.
A mixed number can never be expressed as a proper fraction, or vice versa, because a mixed number and a proper fraction cannot have the same value. A number greater than 1 will never have the same value as a number less than 1.