Registration : Open Test by ForumIAS – May 24 | Online + Offline FEW DAYS BEFORE THE PRELIMS by CSE Rank 373 : SURYAWANSHI MAYUR
Online/Offline Batch Enrollment For Focussed Foundation Program 2019 (limited seats available)
Click Here :- Details | Register | Download Brochure
Unacademy Plus - Live Classes by India’s Best Educators
Seats going fast for all UPSC CSE Prelim's 18 courses. Click on the below link for details -

(1) Last Lap Current Affairs for Prelims 2018           (2) Science and Technology for Mains 2018 & Prelims 2019
(3) Comprehensive module for Ancient, Medieval, Modern History - Pre+Mains    (4) Concepts + latest developments in Environment/Ecology (Pre & Mains)
(5) Class 6-12 NCERT Summary for all the Subjects -Mains 18 & Prelims 19     (6) Important Topics for Mains GS Paper 2 and 3
Learn from India’s Best Educators. Limited Seats! Register now

Which calculator should be used for maths optional?

Senior players please help us choose a good non programmable scientific calculator.


  • I read somewhere in quora that 'casio fx 991ES plus' is good for Maths. But would like others to throw more light into it as I am also now in this preparation.
  • Casio fx 991 ES should do the work as it has all the fuctions and equations can be saved and solved simultaneously in it..using it from 2 years...cost is around 750 rs...
  • @shubh04 I have bought this calculator 2 days back. I started with Newton Raphson - Numerical Analysis but somehow I am not able to solve quadratic equations(linear equations I am able to solve). I followed some youtube videos but somehow it is giving me SYNTAX ERROR. Is there some problem with the calculator ? Please give your feedback.
  • @abias first go to mode option then select option no 5 i.e EQN then choose the format of eqn.for quad eqn it is option 3...then put the values of a,b,c and u will get the solution...hope it helps....
Sign In or Join to comment.

Courses by ForumIAS for CSE
ForumIAS is trusted by over 10,000+ students for their Prelims, Mains and Interview Preparation and we currently run several assistance programs to help students from Civil Services prelims preparation to rank upgradation to IAS. You can enroll for these programs by visiting


We are a secret self-moderated community for Civil Services preparation. Feel free to join, start a discussion, answer a question or just to say Thank you.

Just dont spread the word ;)

Sign in or join with Facebook or Google

Subscribe to ForumIAS Blog