40 is an integer: there can be no proper fraction for any integer other than 0.
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Since the numerator and denominator of the fraction are co-prime, the proper fraction 37/40 is already expressed in simplest form.
No - since 11 is a prime number, the proper fraction 11/40 is as simplified as it can be.
Expressed as a proper fraction in its simplest form, 0.325 is equal to 13/40 or thirteen fortieths.
As a proper fraction - it would be 5/40
Expressed as a proper fraction in its simplest form, 77.5 percent is equal to 31/40 or thirty-one fortieths.