- 08 Jun '06 00:35

Are you struggling to grasp the logic behind multiplication of negative numbers?*Originally posted by bob12***Okay,how can -53 multiplied by 46 equal -2438??**

Think of it this way. Assume you lose 53 dollars in the stock market in one week. Now, if you want to estimate how much you'll lose in 46 weeks, considering this trend continues, you multiply your difference the first week, -53, by the number of weeks, 46, and get -2438. - 08 Jun '06 04:23 / 1 edit

Actually, if you wanted to work out your losses over 46 weeks you'd multiply your losses in one week by the number of weeks.*Originally posted by ark13***Are you struggling to grasp the logic behind multiplication of negative numbers?**

Think of it this way. Assume you lose 53 dollars in the stock market in one week. Now, if you want to estimate how much you'll lose in 46 weeks, considering this trend continues, you multiply your difference the first week, -53, by the number of weeks, 46, and get -2438.

So, 53*46 = 2438

In 46 weeks you'd lose $2438 dollars at the current rate.

Of course you meant a**profit**of $-53 over 46 weeks giving a total**profit**of $-2438. - 08 Jun '06 13:43

Actually ark had that bit right. However I was just pointing out that a negative loss is a profit and a negative profit is a loss. Minor detail really.*Originally posted by Knight Square***Yes, the kiwi is right when**

- x + = -

- x - = +

+ x - = -

pretty much if a negative number is mulityplyed by a positive number the result will always be a negative number whatever the numbers are.

Also same with division. - 08 Jun '06 15:45

good explanation.*Originally posted by ark13***Are you struggling to grasp the logic behind multiplication of negative numbers?**

Think of it this way. Assume you lose 53 dollars in the stock market in one week. Now, if you want to estimate how much you'll lose in 46 weeks, considering this trend continues, you multiply your difference the first week, -53, by the number of weeks, 46, and get -2438.

However, can you explain how -5 mulitiplied by -5 can give you +25? - 08 Jun '06 22:31

You lost five dollars for the last five weeks how much more money did you have at the beginning of this period.*Originally posted by uzless***good explanation.**

However, can you explain how -5 mulitiplied by -5 can give you +25?

Lost five dollars (-5 - forget the units)

Five weeks previous (-5)

(-5) * (-5) = +25

Therefore, five weeks ago you had 25 dollars more. If the trend continues next week (+1) you will have...

(+1) * (-5) = -5

five dollars less than you do now. Money and time are the answers to all of your +/- problems. - 09 Jun '06 00:12

Best explanation I have heard is imagine someone has a giant vacuum pump and is using it to empty a swimming pool. The increase in water is therefore negative. Now imagine someone films the person doing this.*Originally posted by uzless***good explanation.**

However, can you explain how -5 mulitiplied by -5 can give you +25?

Later you are playing around and you watch the tape backwards (a negative). When you do this it looks as if the pool is being filled by the pump (postive increase in water).

So:

negative water increase * negative time = postive water increase