Good to know

As for Operations: matrices can be added, subtracted, multiplied, squared, cubed and inverted. One matrix cannot be divided by another: multiply by the inverse instead. To Change a matrix, load it with MATH, 2, change it, and store it again with MATH, 3. The Size is up to 4 rows and 4 columns; $\displaystyle 3 \times 3$ is shown at a time, and the arrows move around. While the Entry screen is open, no calculation is possible: press ON/C first.