Question about Sharp EL-520XBWH Scientific Calculator - 390 Functions el520xbwh

# Why can't I multiply negative numbers on my El-520x???

So when I want to multiply two negative numbers on my SHARP EL-520x (e.g: -4 x -3) and it show me error 1 same thing when I try to divide two negative numbers (e.g: -4/-3). What should I do???

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Make sure you use the +/- key (located just to the right of the decimal point key) to enter a negative number, not the - key (to the right of the + key, used to subtract one value from another).

For example, press +/- 4 / +/- 3 = to divide -4 by -3 .

Posted on Jan 19, 2013

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Make sure that you are using the negative button (-) and not the minus button next to the + sign. This would give you an error

Posted on Jan 20, 2014

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Posted on Jan 02, 2017

SOURCE: user's manual Sharp EL-531WH

Posted on Aug 10, 2007

SHARP EL-1801V DON'T KNOW HOW TO SET THE DATE AND TIME

Posted on Jun 12, 2008

I Finally figured it out after playing with it for almost 1/2 an hour!

Hit 2nd then Tax + (rate set) it will appear as 0.000 enter your tax rate... mine is 5% so I enter 5.0 then hit 2nd and Tax + (rate set again) And it will work!

It is glorious!!!

Posted on Apr 10, 2009

You can access the .pdf manual for your particular calculator here:

http://www.sharpusa.com/files/cal_man_EL1750PIII.pdf

Page 1 for how to set date/time:

“RATE SET”: To set the date, time, and tax rate, set this switch at the “RATE SET” position.
Date:
• Enter in the order of month, day and year, then press to complete the entry.
• Use to separate month, day, and year.
• When is pressed, the number entered is evaluated and displayed as “date” if the
value is within the following range; “Error” is displayed otherwise, and the previously set
date is restored.
Month: 1 - 12; day: 1 - 31; Year: 2000 - 2099 (in 4 digits) or 00 - 99 (in 2 digits)
Time:
• Enter in the order of hour, minutes, then press to complete the entry.
(There is no entry available for the seconds value. The clock starts at zero second.)
• If the hour/minute digit is less than 10, it is not necessary to enter the first digit “0”.
• Use to separate hour and minute values.
• When is pressed, the number entered is evaluated and displayed as “time” if the
value is within the following range; “Error” is displayed otherwise, and the previously set
time is restored.
Hour: 0 - 23 (24-hour system for the hour entry), Minute: 0 - 59

Posted on Apr 27, 2009

Hello,
The factorial function is shown on you calculator as n! To calculate factorial 4 you proceed as follows 4[2ndF][n!][=] this gives 24
Hope it helps.

Posted on Sep 16, 2009

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### Just got a SHARP EL-531X, it won't do simple calculations with scientific notation, It keep saying

To enter the power of 10 with exponent use the Exp key followed by the exponent. If the exponent is negative, you must use the negation key (-) not the - key (for subtraction).
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