My Math Forum What mean s 'negative number is five times bigger'?

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 October 22nd, 2009, 07:38 AM #1 Member   Joined: Oct 2009 Posts: 39 Thanks: 0 What mean s 'negative number is five times bigger'? Hi! I got such a case: In january medium temp is -10 F, in july it's five times bigger than in january. What is the medium temperature in july? Of course 5(times) x -5 (temperature) gives -25, but -25 is NOT bigger than -5. So, perhaps it should be (+)25. Correct or not? IF it is (+)25 so should it be -5 (temp in january) +25=20 OR 0 (as a starting point for calculation) + 25=25 as medium temp in july? Thank you in advance W
 October 22nd, 2009, 08:24 AM #2 Senior Member   Joined: Mar 2007 Posts: 428 Thanks: 0 Re: What mean s 'negative number is five times bigger'? Hint: Where do you live that it might be a negative reading in July? Although not in context, common sense would assume that they are talking about absolute value differences.
October 22nd, 2009, 09:11 AM   #3
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Re: What mean s 'negative number is five times bigger'?

Quote:
 Originally Posted by David Hint: Where do you live that it might be a negative reading in July? Although not in context, common sense would assume that they are talking about absolute value differences.
Dear David

Thanks for your remark, it is what I mentioned that even mathematically -25 is NOT bigger than -5. Anyway the point is what means five times bigger when we talk about negative numbers. But is there mathematical rule/theorem it should be as we suggest from common sense. It is mathematical, not logical problem.

The second issue is if it should be added to -5 or to zero, as reference level.

 Tags bigger, negative, number, times

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