25 times 1 is 25, but what is the answer if both 25 and 1 are negative numbers? Here we will determine if the answer to negative 25 times negative 1 is positive 25 or negative 25.
There are many different ways to explain and determine if the answer to negative 25 times negative 1 is -25 or +25 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 -25 is the correct answer using basic algebra.
We will test if -25 is correct by setting up the equation negative 25 times negative 1 equals negative 25, and then simplifying the equation to see if it is true.
(-25) (-1) = (-25)
Divide both sides of the equation by (-1) :
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| = |
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The numerator and denominator on the left side both have (-1) which even each other out and can be removed:
| (-25) = |
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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:
| (-25) = |
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A numerator of 25 and denominator of 1 on the right side is the same as 25 divided by 1 which is 25. Now we end up with this untrue equation:
(-25) = (25)
-25 is NOT equal to 25, thus we have proven that negative 25 times negative 1 is not equal to -25. The answer must therefore be 25:
-25 x -1 = 25
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 25 times negative 1 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
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