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1.0 Integer  Links
1.1  Integer A & D
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1.3 mulitiplication/division
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4.0 Two-Variable Equations
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Rules for Adding Integers

 



 

When you add two numbers with the same signs,

 

 

1.   add the absolute values, and
2.   write the sum (the answer) with the sign of the numbers.
 

 

When you add two numbers with different signs,

 

 

1.   subtract the absolute values, and
2.   write the difference (the answer) with the sign of the number  having the larger absolute value.

 

 

 




Practice Adding

 

Examples:    Add :

 

1.  -9 + (-7) = 

 

5.   6 + (-2) = 

2.   –20 + 15 = 

 

6.   (-21) + 21 = 

3.   (-23) + (-7) = 

 

7.   –3 + 8 = 

4.   (+3) + (+5) = 

 

8.   -9 + 6 = 

9.  Add -9 and -5.  

 

10.  Add (-7), (+3), and (-12).  


Subtracting Integer

 


You can subtract a number by adding its opposite.





Practice Subtraction

 

Examples:      Subtract :
 

1.  

9 – (3) =

5.

-10 - (15) =

 

  

 

2.

-7 – (5) =  

6.

-25 - (25) =

  

 

 

3.

21 – (19) =     

7.

3 - (-5) =

  

  

 

4. 

- 5 - 4 =     

8.

9 - 3 =

 

 

 

9.   Subtract (-5) from (10).
        

 

10.   Subtract 4 from (-14).