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Try this.
In multiplication, one number is always count and the other number is always the index, or the count of the count.
Just because you can swap the two with each other, doesn't mean both are the count or both are the index.
So you count with one number, and count the count with the other.
Therefore,
#. if the count is positive and the count of the count is positive, the final sum is positive.
#. if the count is negative and the count of the count is positive, the final count is negative.
#. if the count is positive and the count of the count is negative, the final count is negative.
#. BUT if the count is negative, and the count of the count is negative, then the final count is negative.
The trick is in always seeing one number as the count or quantity, and the other number as the index which is the count of how many times you count.
