Application for addition, subtraction and multiplication operations of matrices up to order 3. It is possible to calculate the inverse matrix and the determinant, as long as it meets the necessary mathematical conditions. The Operations between matrices App presents the basic rules of these options. The user will be able to see the result and understand what to do so that addition, subtraction, multiplication, the existence of an inverse matrix and the calculation of determinants occur. Instructions are received by keeping the aforementioned keys pressed.