Expressed as a top-heavy vulgar fraction, 2 1/3 is equal to 7/3, or seven thirds.
The reciprocal of this is 3/7, or three sevenths.
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1 and 1/3 = 4/3 and the reciprocal would be 3/4
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The reciprocal of 3/10 is 10/3 or 3 1/3 (that is, three and one third).
Since the reciprocal of a fraction is its numerator and denominator reversed, that would make 1/3 into 3/1, which is just 3.
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