Multiplication of Integers is similar to multiplication of whole
numbers (both positive) except the sign of the product needs to be
determined.
If both the factors are positive, the product will be positive.
If both the factors are negative, the product will be positive.
If only one of the factors is negative, the product will be negative.
In other words, if the signs are the same the product will be
positive, if they are different, the product will be negative.