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"I wonder what methods can be used to add and subtract matrices.

Basically we use two methods. Either are very simple. Namely:

1. With the SUM function

2. Matrix formula

Suppose we start the following example:

We proceed to add the four matrices M1 + M2 + M3 + M4. Using the method known simply we move into the cell F24 and write the formula (we use the discontinuous selection to select those cells)

= SUM (B3, B10, F3, F10)

then copy this formula to cell H24 and then copy it down to cell H28.

We can solve this sum using array formulas. To do this we place ourselves in cell F17 and select the range F17: H21. Write the selected range the formula:

= B3: D7 + B10: D14 + F3: H7 + F10: H14

and finish by pressing (as it is input matrix ) ctrl + shift + enter .