9 times 28 is 252, but what is the answer if both 9 and 28 are negative numbers? Here we will determine if the answer to negative 9 times negative 28 is positive 252 or negative 252.
There are many different ways to explain and determine if the answer to negative 9 times negative 28 is -252 or +252 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 -252 is the correct answer using basic algebra.
We will test if -252 is correct by setting up the equation negative 9 times negative 28 equals negative 252, and then simplifying the equation to see if it is true.
(-9) (-28) = (-252)
Divide both sides of the equation by (-28) :
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| = |
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The numerator and denominator on the left side both have (-28) which even each other out and can be removed:
| (-9) = |
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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:
| (-9) = |
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A numerator of 252 and denominator of 28 on the right side is the same as 252 divided by 28 which is 9. Now we end up with this untrue equation:
(-9) = (9)
-9 is NOT equal to 9, thus we have proven that negative 9 times negative 28 is not equal to -252. The answer must therefore be 252:
-9 x -28 = 252
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 9 times negative 28 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 9 times negative 29?
Here is the next problem on our list that we have explained and calculated.
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