1. Operations with Integers
Adding, Subtracting, Multiplying and Dividing Positive and Negative Numbers

2. What are you being asked to do?
Add numbers
Subtract numbers
Multiply numbers
Divide numbers

3. Do you numbers have the same sign or different signs?
Adding Integers
Do you numbers have the same sign or different signs?
Same Signs
Different Signs

4. Same Signs
Keep the sign
Add the numbers
Ex: –4 + (–8) = –12

5. Different Signs
Keep the sign of the number with the bigger absolute value
Subtract like normal
Ex: 7 + (–15) = –8

6. Subtracting Integers Change the subtraction to addition
Change the second number to its opposite
Now click here to follow the addition rules
Ex: 4 – 9
Ex: 3 – (–4)
4 + (–9)
3 + (+4)

7. Multiplying Integers Same signs = positive answer
Different signs = negative answer
Also, if all your are doing is multiplying and there is an even number of negative signs, your answer will be positive. If there is an odd number of negative signs your answer will be negative.

8. Dividing Integers Same signs = positive answer
Different signs = negative answer