Let a,b,c,d-{0}. A mnemonic device for calculating


is KFC. This stands for ”keep-flip-change”. This means that you keep the first fraction as it is, flip the second fraction, and change the problem to a multiplication problem. Thus, the expression above becomes


This yields that

Title keep-flip-change
Canonical name Keepflipchange
Date of creation 2013-03-22 15:59:52
Last modified on 2013-03-22 15:59:52
Owner Wkbj79 (1863)
Last modified by Wkbj79 (1863)
Numerical id 4
Author Wkbj79 (1863)
Entry type Definition
Classification msc 97D40
Synonym KFC
Synonym K.F.C.