**Subtraction of negative number is done by converting the subtraction problem
to an addition problem.**

**For example: 7 - (-4) = The first "-" sign means
subtraction. The second "-" sign means a negative number. The problem
is done in the following way.**

**7 - (-4) becomes 7
+ (+4) and the answer is 11 So we change the subtraction**

**sign to an
addition sign and change the sign of the number that comes immediately**

** after the
subtraction sign. Then we treat the problem as an addition problem and use the
rules of addition to solve the problem.**

**Try this
problem: 8 - (-6) = answer**

**Try this
problem: 9 - (+5) = answer**

**Follow the rules
and try this problem -7 - (-3)
= answer**

**Try thinking of
subtraction problems in this way. Let say you owe $14. We represent the $14
debt as
a -$14. The person you owe the $14 too says you only have to repay
$10. She has taken a -$4 debt away from you.**

**So -$14 -
(-$4) = -$10 To use the rule we would write it this way**

** -$14 - (-$4) = -$14 + (+4) = -$10**