89 times 5 is 445, but what is the answer if both 89 and 5 are negative numbers? Here we will determine if the answer to negative 89 times negative 5 is positive 445 or negative 445.
There are many different ways to explain and determine if the answer to negative 89 times negative 5 is -445 or +445 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 -445 is the correct answer using basic algebra.
We will test if -445 is correct by setting up the equation negative 89 times negative 5 equals negative 445, and then simplifying the equation to see if it is true.
(-89) (-5) = (-445)
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:
| (-89) = |
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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:
| (-89) = |
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A numerator of 445 and denominator of 5 on the right side is the same as 445 divided by 5 which is 89. Now we end up with this untrue equation:
(-89) = (89)
-89 is NOT equal to 89, thus we have proven that negative 89 times negative 5 is not equal to -445. The answer must therefore be 445:
-89 x -5 = 445
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 89 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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