# At a Glance - Adding and Subtracting Matrices

## Adding, Subtracting, and Matrices, Oh My!

It's simple to add and subtract matrices, *but they must always be the same size for it to work*. The answers are always the same size too. Check it out:

All you do is add the entries in each corresponding place:

Subtraction? Same idea.

Now we just subtract the entries in each place:

Looks tough, but as long as you don't lose your place, you're golden. But remember, they *must* be the same size. And a 2 × 3 is *not* the same as a 3 × 2, for example.

#### Exercise 1

Add these matrices or, if not possible, explain why:

#### Exercise 2

Add these matrices or, if not possible, explain why:

#### Exercise 3

Subtract these matrices, or, if not possible, explain why.

#### Exercise 4

Subtract these matrices, or, if not possible, explain why.

#### Exercise 5

Subtract these matrices, or, if not possible, explain why.