“…Mental activities to reverse mathematical concepts are important at all levels of mathematics (e.g., addition and subtraction of the whole number, differentiation and integration in calculus, exponent and logarithm, function and inverse function) (Ellis, Ozgur, Kulow, Dogan, & Amidon, 2016;Haciomeroglu, Aspinwall, & Presmeg, 2010;Ramful, 2014;Simon, Kara, Placa, & Sandir, 2016). Some researchers have explained reversible reasoning in addition and multiplication (Hackenberg, 2010;Steffe & Olive, 2010); however, reversible reasoning in the function domain has not been given much attention.…”