General Question

Gooood's avatar

How to fix my calculator?

Asked by Gooood (50 points ) 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?

Observing members: 0 Composing members: 0

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

@gagara
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

Answer this question

Login

or

Join

to answer.

This question is in the General Section. Responses must be helpful and on-topic.

Your answer will be saved while you login or join.

Have a question? Ask Fluther!

What do you know more about?
or
Knowledge Networking @ Fluther