66 times 1 is 66, but what is the answer if both 66 and 1 are negative numbers? Here we will determine if the answer to negative 66 times negative 1 is positive 66 or negative 66.
There are many different ways to explain and determine if the answer to negative 66 times negative 1 is -66 or +66 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 -66 is the correct answer using basic algebra.
We will test if -66 is correct by setting up the equation negative 66 times negative 1 equals negative 66, and then simplifying the equation to see if it is true.
(-66) (-1) = (-66)
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:
| (-66) = |
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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:
| (-66) = |
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A numerator of 66 and denominator of 1 on the right side is the same as 66 divided by 1 which is 66. Now we end up with this untrue equation:
(-66) = (66)
-66 is NOT equal to 66, thus we have proven that negative 66 times negative 1 is not equal to -66. The answer must therefore be 66:
-66 x -1 = 66
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 66 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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