When multiplying integers, a simple sign rule applies: same signs give a positive result, different signs give a negative result. After fixing the sign, multiply the absolute values.
So (−a)⋅(−b)=ab, and (−a)⋅b=−(ab) for a,b>0.
Same signs → positive product
Different signs → negative product
∣a⋅b∣=∣a∣⋅∣b∣
Sign rule explained
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