When adding a positive and a positive... 

Just add the 2 numbers and use the same sign. 
 
^{+}8 + ^{+}2 = 

^{+}10 
 
When adding a positive and a negative... 

Subtract the 2 numbers and use the sign of the number with the greater absolute value. 
 
^{+}8 + ^{}12 = 

^{}4 
 
When subtracting integers... 

Change the minus sign to addition, and the second integer to its opposite, then follow addition rules. Don't change the first number. 
 
^{}5  ^{+}16 Changes to what? 

^{}5 + ^{}16 
 
^{}15  ^{}20 = 

^{+}5 
 
When multiplying or dividing integers with the same sign the answer is always... 

positive 
 
When multiplying or dividing integers with different signs the answer is always... 

negative. 
 
^{+}12 x ^{+}3 = 

^{+}36 
 
^{}15 x ^{+}3 = 

^{}45 
 
^{}20 x ^{}3 = 

^{+}60 
 
When adding a negative and a negative... 

Just add the numbers and use the same sign (negative.) 
 
^{}20 + ^{}3 = 

^{}23 
 
^{}40 / ^{}4 = 

^{+}10 
 
^{}35 / ^{+}7 = 

^{}5 
 
^{+}3x  ^{+}2=
(when x = ^{}3) 

^{}11 
 
4  5a
(when a = ^{}1) 

^{+}9 
 
x / 10 = 12 

x = ^{ }120 
 
r + 56 = ^{ }30 

r = ^{ }86 
 
p  93 = 12 

p = 105 
 
6h = ^{}48 

h = ^{}8 
 