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Multiplying Positive and Negative Numbers?

TopBefore digging into the rules of multiplying Positive and Negative Numbers, we should first learn about positive numbers and negative numbers.
Positive numbers are the numbers which are greater than zero, for example: 1, 6, 4.009, 0.00001 and negative numbers are the numbers which are less than zero, for example: -1, -7.8, -0.00001. And for every positive number there is a negative number, which is it's opposite. We represent that opposite by writing a negative or minus sign in front of that number and call those numbers as negative numbers. Similarly, positive numbers are the opposite of negative numbers.
We refer to the sign of a number to recognize whether the number is positive or negative, for example: the sign of 32 is positive and the sign of -87 is negative. Now coming on to multiplying positive and negative numbers, here are some rules for that:
For multiplying positive and negative numbers, we need to know or recognize the signs of the numbers.
If we are multiplying a positive number with a negative number then the result will be a negative number.
If we are multiplying a positive number with a positive number then the result will be a positive number.
If we are multiplying a negative number with a positive number then the result will be a negative number.
If we are multiplying a negative number with a negative number then the result will be a positive number.
This shows that while multiplying positive and negative numbers, if the signs of both the numbers are same then the result is always positive otherwise it is always negative.
Examples on multiplying positive and negative numbers;
4*5 = 20
This shows that 5 times 4 or 4 times 5 is equal to 20.
-4*5 = -20.
This shows that a negative 4 times 5 or 5 times a negative 4 is equal to negative 20.
-4*-5 = 20,
This shows that a negative 4 times negative 5 is equal to positive 20, as every time a minus 4 is multiplied with a negative 5 it changes the result into positive and likewise making the whole result as positive 20.