Here is a table for multiplication / division of positive/negative numbers.
X/ + = +
X/ - = -
X/ + = -
X/ - = +
NB 'X/' means multiply or division.
NNB If there is no sign in front of a number treat it as positive (+).
e.g.
2 X 2 = 4 (Note ; no symbols, so it is treated as plus(+))
2 X -2 = -4
-2 X 2 = -4
-2 x -2 = (+)4
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A negative divided by a positive is negative. A negative divided by a negative is positive. A positive divided by a positive is positive. A positive divided by a negative is negative.
negative
A negative divided by a positive is a negative.
Negative
A negative divided or multiplied by a negative is always positive. Just like how in English, a double-negative is positive.