57 times 80 is 4560, but what is the answer if both 57 and 80 are negative numbers? Here we will determine if the answer to negative 57 times negative 80 is positive 4560 or negative 4560.
There are many different ways to explain and determine if the answer to negative 57 times negative 80 is -4560 or +4560 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 -4560 is the correct answer using basic algebra.
We will test if -4560 is correct by setting up the equation negative 57 times negative 80 equals negative 4560, and then simplifying the equation to see if it is true.
(-57) (-80) = (-4560)
Divide both sides of the equation by (-80) :
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| = |
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The numerator and denominator on the left side both have (-80) which even each other out and can be removed:
| (-57) = |
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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:
| (-57) = |
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A numerator of 4560 and denominator of 80 on the right side is the same as 4560 divided by 80 which is 57. Now we end up with this untrue equation:
(-57) = (57)
-57 is NOT equal to 57, thus we have proven that negative 57 times negative 80 is not equal to -4560. The answer must therefore be 4560:
-57 x -80 = 4560
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 57 times negative 80 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 57 times negative 81?
Here is the next problem on our list that we have explained and calculated.
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