For Periods B, F, and G - tips on subtracting integers

To subtract integers you need to know one basic rule, that rule is:

"Add the opposite."

For example let's try the following problem 4 - (-4).
First you would change this to 4 + (+4), then by following your rules for adding integers you would simply add 4 + 4 to obtain the answer 8.

Let's try another one -20 - (-5).
First I would change this so I am "adding the opposite."
So we change -20 - (-5) to -20 + (+5).
Next we follow our rules for adding integers and obtain the answer which is -15.

(if you need clarification on adding integers see post "Periods B, F, and G - notes on adding integers" which was posted on Sept. 9th)