9 times 47 is 423, but what is the answer if both 9 and 47 are negative numbers? Here we will determine if the answer to negative 9 times negative 47 is positive 423 or negative 423.
There are many different ways to explain and determine if the answer to negative 9 times negative 47 is -423 or +423 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 -423 is the correct answer using basic algebra.
We will test if -423 is correct by setting up the equation negative 9 times negative 47 equals negative 423, and then simplifying the equation to see if it is true.
(-9) (-47) = (-423)
Divide both sides of the equation by (-47) :
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| = |
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The numerator and denominator on the left side both have (-47) 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 423 and denominator of 47 on the right side is the same as 423 divided by 47 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 47 is not equal to -423. The answer must therefore be 423:
-9 x -47 = 423
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 9 times negative 47 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 48?
Here is the next problem on our list that we have explained and calculated.
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