Improper fractions and proper fractions are mutually exclusive; one can't be the other.
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a proper fraction
31/5 is an improper fraction and is 6 and 1/5 as a mixed number
31/6 = 5 and 1/6
Expressed as a proper fraction in its simplest form, 2/9 - 5/7 = -31/63 or negative thirty-one sixty-thirds.
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 5, 25/155 is equal to 5/31 or five thirty-firsts.