You can either subtract the whole number from the whole number and the fraction from the fraction. 2-2=0 and (5/2) - (3/2) = 2/2 = 1.
Or convert each to an improper fraction then subtract (multiple denominator by whole number, add the numerator - that's the new numerator and the denominator is the denominator of the existing fraction part.)
(9/2) - (7/2) = 2/2 = 1
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