One third less than zero.
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The separater to make the negative and positive numbers opposites?
This is NOT a proof, just an explanation. Imagine you are on a number line and you are walking. Multiplying x*y is taking x steps, each of size y. Negative steps are interpreted by requriring you to face the negative end of the line before you start walking and negative step sizes are backward where backward is heel first. This mean to find, -x*-y you stand on zero, face in the negative direction, and then take x backward steps, each of size y.
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
Yes, it does.
It means that the number is negative. Negative numbers are always under 0.