Cannot figure out how to use the reverse log on my Staples Textbook display BD-6410 Calculator the pOH is 6.59 I need to use the reverse log to get the answer for the H+ which is the reverse log of 6.59 answer is 2.6 x 10 to the -7 I get an answer of -1.9981 x 10 the -1 I tried reading instructions but they were no help I press In then log then put in the number my textbook says put in -6.59 but when I try that it won't calculate I've tried switching and pressing log first that don't work Help please I need to write a test Thank you Lillian

To find percentages on this calculator, or any calculator, you divide one number by the other, and multiply the result by 100.

For example, for 2 out of 5, we type in 2, hit the divide button, type in 5 and hit the equals sign and we will get 0.4. To make this into percentage, we then multiply the answer by 100 to get 40%.

Good luck,

Paul

Dont know what you are saying.
Basically turn it off and on if your stuck.

On the Staples Scientific Calculator BD-107i, I can't find the fraction function. I don't think there is one.

Download manual for: Casio fx-115ES, fx-570ES, fx-991ES, any should do the job. Download the Appendix, too.

http://support.casio.com/en/manual/manuallist.php?cid=004

above the DEL key, you should have a button S (2 sided arrows) D. press that, and it will give you the decimal value. If you know how to use this calculator, it is a great help in almost any math course.
cheers

I want to set up the tax rate on my BD-6235T Staples calculator ??

Here is the link to the calculator manual. It will show you how to do square root calculations, percentages, other roots, and logs. As to ratios and proportions you will have to read your mathematics textbook.

http://www.product-support-staples.com/DisplaySKU_fr.aspx?SKU=BD-6120G

What is BIN at the top of the screen? How do you get rid of it?

Hello,
There is something missing in the formulation.

Any way you cannot calculate it directly on this calculator.You need to use the formula

log_5 (a)= ln(a) x log_5 (e) a is a positive integer

where log_5 means log in base 5 (my notation for the function)
e is the base of the natural logarithms (e=2.71928 )
ln is the natural log function

To obtain a more accurate value of e, calculate e^(1)
Here are some values of log(e) in different bases (for you to play with)

log_2(e)= 1.442695041
log_3(e)=0.9102392266
log_4(e)=0.7213475204
log_5(e)=0.6213349346
log_6(e)=0.5581106266
log_7(e)=0.5138983424
log_8(e)=0.4808983470
log_9(e)=0.4551196133
log_10(e)=log(e)=0.4342944819

If you have to use log in bases other than 10 or e, you will need a claculator that does that at the touch of a button. Some calculators that handle these calculations are the Casio FX-300ES, FX-115ES,FX-991ES, those called Natural Display, or WriteView(Sharp) or Textbook display.

Hope it helps.