General Question

Gooood's avatar

How to fix my calculator?

Asked by Gooood (50points) January 10th, 2010

Here’s an example. If I type in 0.30×10^-12 / 1.6×10^-19 = 1.875×10^-32

When the answer should be 1.875×10^-8.

I have to type in 0.30 / 1.6×10^-7 for it to give me the right answer why is it doing this?

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9 Answers

ccrow's avatar

Maybe it needs new batteries??

gagara's avatar

type 0.30×10^-12 / 1.6 / 10^-19
or 0.30×10^-12 / ( 1.6×10^-19 )
or 0.3E-12 / 1.6E-19

After all, when you do 0.30×10^-12 / 1.6×10^-19 it is 0.30 times 10^-12 divide by 1.6 times 10^-19.

Hope that makes sense…

Gooood's avatar

Thanks so much, it’s just me being silly.

jerv's avatar

Makes me glad that my HP-48G uses Reverse Polish Notation…

whothei0's avatar

just a tip you can never use too many parentheses. they are a great way to make sure the calculator is doing what you want it to do. they may seem to be a little bit of a waist but they do work.

jerv's avatar

@whothei0 I’ve been known to nest them 4–5 deep for some of the stuff I do. That way, you know operations will be performed in the correct order.

whothei0's avatar

lol way too true especially in programs! there you NEED them. i have made that mistake before and never going to do that again.

jerv's avatar

I have a program that you enter the rim size, tire width, and profile (to calculate the tire’s circumference) along with a couple of gear ratios and then you can figure out the car speed in MPH from the engine RPM or vice-versa. Try that without a lot of parenthesis!

whothei0's avatar

wow that is crazy! the best i have i wrote one to solve a three variable problem it was over 18 lines. took forever to write it

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