27 times 5 is 135, but what is the answer if both 27 and 5 are negative numbers? Here we will determine if the answer to negative 27 times negative 5 is positive 135 or negative 135.
There are many different ways to explain and determine if the answer to negative 27 times negative 5 is -135 or +135 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 -135 is the correct answer using basic algebra.
We will test if -135 is correct by setting up the equation negative 27 times negative 5 equals negative 135, and then simplifying the equation to see if it is true.
(-27) (-5) = (-135)
Divide both sides of the equation by (-5) :
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| = |
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The numerator and denominator on the left side both have (-5) which even each other out and can be removed:
| (-27) = |
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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:
| (-27) = |
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A numerator of 135 and denominator of 5 on the right side is the same as 135 divided by 5 which is 27. Now we end up with this untrue equation:
(-27) = (27)
-27 is NOT equal to 27, thus we have proven that negative 27 times negative 5 is not equal to -135. The answer must therefore be 135:
-27 x -5 = 135
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 27 times negative 5 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
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