Trick No. 3 – Multiplying Positive and Negative Numbers
Posted by admin on Feb 1, 2010 in Tips and Tricks |
This is a great mnemonic (way of remembering) what the sign of your answer should be when multiplying positive and negative numbers:
Think:
good = pos
bad = neg
A good thing happening to a good person is good.
(pos × pos = pos)
A good thing happening to a bad person is bad.
(pos × neg = neg)
A bad thing happening to a good person is bad.
(neg × pos = neg)
A bad thing happening to a bad person is good.
(neg× neg = pos)
Thanks again to OnlineMathLearning.com for another great idea!