Reciprocal of 9 over 16 is 16 over 9.
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The reciprocal of a fraction is found by flipping the numerator and denominator. Therefore, the reciprocal of 11 over 16 is 16 over 11. This means that if you multiply 11 over 16 by its reciprocal, you will get 1, as they are multiplicative inverses of each other.
9/7 is the reciprocal of 7/9.9/7
To divide by a fraction, multiply by its reciprocal. In this instance, 16/21 / 8/9 is equal to 16/21 x 9/8 = 0.857142 recurring (that is, 0.857142857142...)
To take a reciprocal, all you have to do is switch the numerator and denominator. So for 3/16, the reciprocal would be 16/3.
8/9