No-holds-barred calculation

To be successful in learning mathematics, students must maintain control over the results of their numerical calculations. Unrestrained calculation is intended to facilitate this control without the use of technical tools. Indeed, the agile calculation which makes the originality of the proposed method, will familiarize and reconcile you with numbers. It leaves less written traces than the traditional algorithm and thus increases performance in multiplications between two numbers. The book proposes eight operating techniques from 11x11 to 99x99. It is intended for students as well as teachers. Marie Chiocca is a lecturer in didactics of mathematics.