4 and 7
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The reciprocal of 18/7 is 7/18.
yes
Where you divide one by the number for example the reciprocal of 2/7 is 3.5 or of 0.25 is 4. =)
If the rational number is in the form of a proper or improper fraction, just exchange the numerator and the denominator. Thus, the reciprocal of 7/4 is 4/7.