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Signed Numbers

Subtraction

Subtraction of a number is equivalent to adding its negative. That is:

x - y = x + (-y) for any numbers x and y.

For example:

                                  

                   

     

 

Subtracting a negative number is equivalent to adding is positive. That is,

     

and in general,

     


Example 2.

Look at the examples of subtracting negative numbers below:


=   


Exercise 2.

Try subtracting some negative numbers yourself!



=   



Exercise 3.

Now try some exercises involving both subtraction and addition.



+ =   



For extension of subtraction of signed numbers from integers to signed decimal numbers go to Subtracting Signed Decimal Numbers.

<< Addition | Signed Numbers Index | Multiplication >>

 

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