Integer Operations
Addition, subtraction, multiplication, and subtraction
Introduction
Rules for addition
2.- If both signs are the same then you add and stay with the same sign.
3.- If they are different then you will subtract and stay with the sign of the highest number.
EXAMPLES:
-2+(-6)= -8
-4+6= 2
-6+(-12)= -18
Adding
Adding
Adding
Then in the other one there are different signs so we subtract and we stay with the sign of the highest number in this case -6 so the answer would be negative.
And is the same in the next example.
Rules for subtracting
Rules for subtracting
Then if you have like signs you add the numbers and stay with the sign.
Then if you have different signs you subtract and stay with the highest number sign.
Remember to change all the numbers to addition.
EXAMPLES:
-3-1= -4
-3-(-2)= -5
-5-4= -9
Rules for multiplication
Then if they are like signs they stay positive.
Then if they are unlike signs the answer would be negative.
EXAMPLES:
-3*-2= 6
-4*-8= 32
-9*3= -27
Rules for division
Then if they are like signs they stay positive.
Then if they are unlike signs the answer would be negative.
EXAMPLES:
-12/-3= 4
-45/5= -9
-25/-5= 5