To find the reciprocal of a fraction turn it upside down:
1/(9/11) = 11/9 = 1 2/9
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11/7
21/9 = 19/9 so its reciprocal is 9/1921/9 = 19/9 so its reciprocal is 9/1921/9 = 19/9 so its reciprocal is 9/1921/9 = 19/9 so its reciprocal is 9/19
Reciprocal of 9 over 16 is 16 over 9.
The reciprocal of 9 is 1/9 or one ninth. Expressed as a decimal, this is equal to 0.1 recurring (that is, 0.1111...)
9/7 is the reciprocal of 7/9.9/7