1. Multiplication and integers
Solve using rules of
Multiplication and integers

2. Numbers have different sign
Solve using rules of multiplication and integers
Example 1: What is + ( +7 ) – ( +8)
First convert two symbols into 1, using rules of multiplication
+( +7 )  and -( +8)  -8
Therefore +( +7 ) – ( +8 )  +7 – 8
Now we can solve using rules of integers as given below
-7 + 8
Numbers have different sign
Using Rule 2 –
Subtract the numbers and copy bigger number sign
8- 7 = 1
Bigger number sign is “ – “
Answer : --1

3. Numbers have different sign
Solve using rules of multiplication and integers
Example 2: What is -( -5 ) + ( -4)
First convert two symbols into 1, using rules of multiplication
-( -5 )  +5 and +( -4)  -4
Therefore -( -5 ) + ( -4)  +5 – 4
Now we can solve using rules of integers as given below
+5 - 4
Numbers have different sign
Using Rule 2 –
Subtract the numbers and copy bigger number sign
5- 4 = 1
Bigger number sign is “ + “
Answer : -+1

4. +( -7 )  -7 Solve using rules of multiplication and integers
Example 2: What is +( -7 ) - 5
First convert two symbols into 1, using rules of multiplication
+( -7 )  -7
Therefore +( -7 ) - 5 
Now we can solve using rules of integers as given below
-7 - 5
Numbers have same sign
Using Rule 1-
Add the numbers and copy bigger number sign
7+5 = 12
Bigger number sign is “ - “
Answer : -
-12

5. Try these
+ ( -6 ) - ( -5 )
- ( -4 ) - ( +7 )
- ( +8 ) - ( -3 )