81 times 6 is 486, but what is the answer if both 81 and 6 are negative numbers? Here we will determine if the answer to negative 81 times negative 6 is positive 486 or negative 486.
There are many different ways to explain and determine if the answer to negative 81 times negative 6 is -486 or +486 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 -486 is the correct answer using basic algebra.
We will test if -486 is correct by setting up the equation negative 81 times negative 6 equals negative 486, and then simplifying the equation to see if it is true.
(-81) (-6) = (-486)
Divide both sides of the equation by (-6) :
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| = |
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The numerator and denominator on the left side both have (-6) which even each other out and can be removed:
| (-81) = |
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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:
| (-81) = |
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A numerator of 486 and denominator of 6 on the right side is the same as 486 divided by 6 which is 81. Now we end up with this untrue equation:
(-81) = (81)
-81 is NOT equal to 81, thus we have proven that negative 81 times negative 6 is not equal to -486. The answer must therefore be 486:
-81 x -6 = 486
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 81 times negative 6 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
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