Difference between revisions of "Commutative"

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Revision as of 21:13, 4 October 2015

Maths.

Multiplication and addition are commutative

The commutative property of multiplication means that the ordering of the items multiplied together makes no difference to the final result.

Example 1

3 x 4 gives the same result as 4 x 3.


In the first case:

3 x 4 = 12


In the second case:

4 x 3 = 12


Example 2

The commutative property also applies to addition.

4 + 5 gives the same final result as 5 + 4.


Both expressions give the result 9.


Division and subtraction are not commutative

The commutative property does not apply to division. The order of items being divided does make a difference to the final result.

Example 3

20 / 4 gives a different result from 4 / 20.


In the first case:

20 / 4 = 5


In the second case:

4 / 20 = 0.2


Example 4

The commutative property does not apply to subtraction.

5 - 3 gives a different result from 3 - 5.


The result of the first expression is +2.

The second expression produces -2.


See also