78 times 53 is 4134, but what is the answer if both 78 and 53 are negative numbers? Here we will determine if the answer to negative 78 times negative 53 is positive 4134 or negative 4134.
There are many different ways to explain and determine if the answer to negative 78 times negative 53 is -4134 or +4134 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 -4134 is the correct answer using basic algebra.
We will test if -4134 is correct by setting up the equation negative 78 times negative 53 equals negative 4134, and then simplifying the equation to see if it is true.
(-78) (-53) = (-4134)
Divide both sides of the equation by (-53) :
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| = |
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The numerator and denominator on the left side both have (-53) which even each other out and can be removed:
| (-78) = |
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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:
| (-78) = |
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A numerator of 4134 and denominator of 53 on the right side is the same as 4134 divided by 53 which is 78. Now we end up with this untrue equation:
(-78) = (78)
-78 is NOT equal to 78, thus we have proven that negative 78 times negative 53 is not equal to -4134. The answer must therefore be 4134:
-78 x -53 = 4134
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 78 times negative 53 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 78 times negative 54?
Here is the next problem on our list that we have explained and calculated.
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