Is the multiplicative inverse for 12/13 13/12?
Right.
http://www.coolmath.com/prealgebra/06-properties/09-properties-multiplicative-inverse-01.htm
12/13
In order to find the multiplicative inverse of a fraction, you need to flip the numerator and denominator of the fraction.
The given fraction is 12/13. To find its multiplicative inverse, we need to flip the numerator (12) and denominator (13). So, the multiplicative inverse of 12/13 is 13/12.
Therefore, the answer to your question is yes, the multiplicative inverse of 12/13 is indeed 13/12.