66 times 7 is 462, but what is the answer if both 66 and 7 are negative numbers? Here we will determine if the answer to negative 66 times negative 7 is positive 462 or negative 462.
There are many different ways to explain and determine if the answer to negative 66 times negative 7 is -462 or +462 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 -462 is the correct answer using basic algebra.
We will test if -462 is correct by setting up the equation negative 66 times negative 7 equals negative 462, and then simplifying the equation to see if it is true.
(-66) (-7) = (-462)
Divide both sides of the equation by (-7) :
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| = |
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The numerator and denominator on the left side both have (-7) 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 462 and denominator of 7 on the right side is the same as 462 divided by 7 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 7 is not equal to -462. The answer must therefore be 462:
-66 x -7 = 462
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 66 times negative 7 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
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