11 times 5 is 55, but what is the answer if both 11 and 5 are negative numbers? Here we will determine if the answer to negative 11 times negative 5 is positive 55 or negative 55.
There are many different ways to explain and determine if the answer to negative 11 times negative 5 is -55 or +55 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 -55 is the correct answer using basic algebra.
We will test if -55 is correct by setting up the equation negative 11 times negative 5 equals negative 55, and then simplifying the equation to see if it is true.
(-11) (-5) = (-55)
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:
| (-11) = |
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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:
| (-11) = |
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A numerator of 55 and denominator of 5 on the right side is the same as 55 divided by 5 which is 11. Now we end up with this untrue equation:
(-11) = (11)
-11 is NOT equal to 11, thus we have proven that negative 11 times negative 5 is not equal to -55. The answer must therefore be 55:
-11 x -5 = 55
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 11 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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