About Integer Multiplication and Division
Multiplication and Division of integers work similar as you have learned before.
Just multiply or divide the values of the two integers and then consider, that if the two integers have the same sign the result will be positive, if their signs are different, then the result will have a negative sign.
(+) * (+) = (+) (-) * (-) = (+) (+) * (-) = (-) (-) * (+) = (-) (+) : (+) = (+) (-) : (-) = (+) (+) : (-) = (-) (-) : (+) = (-)