99 times 89 is 8811, but what is the answer if both 99 and 89 are negative numbers? Here we will determine if the answer to negative 99 times negative 89 is positive 8811 or negative 8811.
There are many different ways to explain and determine if the answer to negative 99 times negative 89 is -8811 or +8811 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 -8811 is the correct answer using basic algebra.
We will test if -8811 is correct by setting up the equation negative 99 times negative 89 equals negative 8811, and then simplifying the equation to see if it is true.
(-99) (-89) = (-8811)
Divide both sides of the equation by (-89) :
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| = |
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The numerator and denominator on the left side both have (-89) which even each other out and can be removed:
| (-99) = |
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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:
| (-99) = |
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A numerator of 8811 and denominator of 89 on the right side is the same as 8811 divided by 89 which is 99. Now we end up with this untrue equation:
(-99) = (99)
-99 is NOT equal to 99, thus we have proven that negative 99 times negative 89 is not equal to -8811. The answer must therefore be 8811:
-99 x -89 = 8811
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 99 times negative 89 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 99 times negative 90?
Here is the next problem on our list that we have explained and calculated.
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