18 times 22 is 396, but what is the answer if both 18 and 22 are negative numbers? Here we will determine if the answer to negative 18 times negative 22 is positive 396 or negative 396.
There are many different ways to explain and determine if the answer to negative 18 times negative 22 is -396 or +396 using mathematical terms such as additive inverse and mathematical laws like the Distribute Law.
We will take a different approach - process of elimination: We will simply test if -396 is the correct answer using basic algebra.
We will test if -396 is correct by setting up the equation negative 18 times negative 22 equals negative 396, and then simplifying the equation to see if it is true.
(-18) (-22) = (-396)
Divide both sides of the equation by (-22) :
|
| = |
|
The numerator and denominator on the left side both have (-22) which even each other out and can be removed:
| (-18) = |
|
The numerator and denominator on the right side both have a minus sign (-) which even each other out and can be removed:
| (-18) = |
|
A numerator of 396 and denominator of 22 on the right side is the same as 396 divided by 22 which is 18. Now we end up with this untrue equation:
(-18) = (18)
-18 is NOT equal to 18, thus we have proven that negative 18 times negative 22 is not equal to -396. The answer must therefore be 396:
-18 x -22 = 396
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 18 times negative 22 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 18 times negative 23?
Here is the next problem on our list that we have explained and calculated.
Copyright | Privacy Policy | Disclaimer | Contact