5/2
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5/2 To find the reciprocal, you flip the top (numerator) and bottom (denominator) of the fraction.
2 and 1/2 would be 5/2 the reciprocal of 5/2 would be 2/5
no "to reciprocal" is meaningless. If you mean can you take a reciprocal of a fraction, then the reciprocal of 5/97, for example, is 97/5 in just the same way that the reciprocal of 2 (think of 2/1) is 1/2.
21/2 = 5/2 ⇒ reciprocal of 21/2 = 1 ÷ 5/2 = 2/5
2 1 over 5 is 11/5. So, its reciprocal is 5/11