Only two matrices of the same order can be added or subtracted.

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## Glossary

### union

The union of two sets A and B is the set containing all the elements of A and B.

**Full Glossary List**

More in this topic

1 Adding matrices

2 Subtracting matrices

3 Sums and products

4 Adding matrices 2

5 Adding matrices 3

6 O-test 1

7 O-test 2

8 Multiplying matrices

9 Multiplying matrices 2

10 Multiplying matrices 3

11 Multiplying matrices 4

12 Multiplying matrices 5

13 Multiplying matrices 6

14 Multiplying matrices 7

15 Multiplying matrices 8

16 The identity matrix

17 Multiplying by a scalar

18 Multiplying by a scalar 2

19 Multiplying by a scalar 3

20 Using scalars

21 Commutativity

22 Associativity

23 Distributivity

24 O-test 3

25 O-test 4

26 O-test 5

27 O-test 6

28 O-test 7

29 Exam O-test

30 Exam Question 2007

31 Exam Question 2007

32 Exam Question 2007

33 Exam Question 2008

34 Exam Question 2008

35 Exam Question 2008

36 Exam Question 2009