9 times 24 is 216, but what is the answer if both 9 and 24 are negative numbers? Here we will determine if the answer to negative 9 times negative 24 is positive 216 or negative 216.
There are many different ways to explain and determine if the answer to negative 9 times negative 24 is -216 or +216 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 -216 is the correct answer using basic algebra.
We will test if -216 is correct by setting up the equation negative 9 times negative 24 equals negative 216, and then simplifying the equation to see if it is true.
(-9) (-24) = (-216)
Divide both sides of the equation by (-24) :
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| = |
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The numerator and denominator on the left side both have (-24) which even each other out and can be removed:
| (-9) = |
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The numerator and denominator on the right side both have a minus sign (-) which even each other out and can be removed:
| (-9) = |
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A numerator of 216 and denominator of 24 on the right side is the same as 216 divided by 24 which is 9. Now we end up with this untrue equation:
(-9) = (9)
-9 is NOT equal to 9, thus we have proven that negative 9 times negative 24 is not equal to -216. The answer must therefore be 216:
-9 x -24 = 216
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 9 times negative 24 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 9 times negative 25?
Here is the next problem on our list that we have explained and calculated.
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