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Item 524

Negative Numbersssss.

Can anyone explain in a clear and concise way, in English that is understandable by middle schoolers, why a negative number times a negative number is a positive number but a negative number plus a negative number is always negative?

e.g., ( -41 )( -10 ) = +410  but  ( -41 ) + ( -10 ) = - 51 


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Source: : PLEASE PROVIDE A PHYSICAL, PRACTICAL EXAMPLE OF (-)(-) = +
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