HELP: Positives and Negative with addition and subtraction

Here's an easy rule to memorize:

"Subtracting a negative number is the same as adding its opposite."


Here's an example.

5 - (-6)

The opposite of -6 is 6, so the rule says that subtracting negative six is the same as adding positive six.

Use the rule to change the expression from subtraction to addition:

5 + 6


You can do the same thing, in your exercise, working from left-to-right. :cool:
 
Here's another easy rule to memorize:

"Adding a negative number is the same as subtracting its opposite."


Here's an example.

7 + (-4)

The opposite of -4 is 4, so the rule says that adding negative four is the same as subtracting positive four.

Use the rule to change the expression from addition to subtraction:

7 - 4


You can do the same thing, in your exercise, working from left-to-right. :cool:
 
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