Why does multiplying two negatives give a positive?
A quick Math Minute explaining why does multiplying two negatives give a positive.
Math Minute
Why does multiplying two negatives give a positive is a compact mathematical idea. Start with its definition, connect it to one simple example, keep units or labels attached to the numbers, and check whether the result is reasonable. A calculator can verify arithmetic, but the definition tells you which operation belongs in the problem.
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