Casio fx-991ES Trick to Surprise Your Friends

Friends here I show you a simple but awesome CASIO fx-991ES trick. Just learn this trick and show it to your friends and get an awww……..:)  from them. So get ready to surprise your friends.

Casio FX991ES

But before we proceed, let me tell you something. This trick works in CASIO fx-991ES (and not in CASIO fx-991ES plus) and I have manually tested it. So read the following simple steps ‘carefully’ and do exactly as specified. For simplicity and better understanding, and to avoid confusion I have arranged the trick in step by step manner.

  1. First set your calculator on default mode i.e., comp, degree and MthIO mode. If it’s not set then press shift >>press 9 >> press 3 for ALL >>press=>>press AC key now default mode is set.

  2. Now write pol(0,1).  Shift >> + key>> 0 >>shift >> ‘)’ key (or  X key) >>1>> ’)’  key.

  3. Press =

          You will get r=1, angle(theta)=90 degree  as output.

  1. Press AC.

  2. Press fraction key 10 times.

  3. Press the right key on the REPLY button until you reach down and get out of the fraction.

  4. Press 1.

  5. Press x^(power) button,(above sin button).

  6. Press = . You will get a syntax error but no problem, proceed.

  7. Press  AC .

  8. Press up key on reply button, output will be pol(0,1).

  9. Press AC

  10. Press left key three times.

  11. Press DEL to delete 1 . It should appear

         R=1,angle(theta)=90 degree.

  1. Press fraction key.

  2. Press 1 in numerator.

  3. Come down and press 1 in denominator.

         Output: 1/1 r=1, theta= 90.

  1. Press =

  2. Press Abs key or (shift >> hyp key) five times.

  3. Press under root key until the magic occurs.

Do the above steps as it is and see what happens. Many have reported that this trick also works in fx-570ES and fx-85ES. Check it in your calculator and let me know about it through your comments. Don’t like reading? Want some visual stuff. Here is a YouTube video which will demonstrate exactly how to do this Casio trick.

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Comments 10

  1. Sagar Timalsina December 7, 2013
    • Vinay Kumar Jaiswal December 7, 2013
      • Sagar Timalsina December 11, 2013
  2. Gopal December 10, 2013
  3. Vinay Kumar Jaiswal December 12, 2013
  4. Sagar Timalsina December 15, 2013
  5. siraj January 19, 2014
  6. Ashish December 12, 2014
  7. Candie March 14, 2017

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