Turn on thread page Beta
    • Thread Starter
    Offline

    1
    ReputationRep:
    How do you decide how many s.f or d.p do you decide to leave your answer too?

    As its pointless losing silly marks for inaccurate answers.

    Thanks for all help
    Offline

    10
    ReputationRep:
    Depends what you're doing, ie maths or physics.

    If you're doing maths and you end up with an answer like \pi \ln 5 leave it as that.

    If you're doing something like Simpson's rule and they don't give you the number of figures to give, go for 3sf I'd say, maybe 4 (depending on how many steps you do in the method).

    If you're doing physics, then go to 1 sf less than the most inaccurate measurement they give you, in that if they give you measurements with 3sf in all of them, only go to 2. Beyond that the errors are too large for your last digit to many anything.
    Offline

    18
    ReputationRep:
    (Original post by AlphaNumeric)
    Depends what you're doing, ie maths or physics.

    If you're doing maths and you end up with an answer like \pi \ln 5 leave it as that.

    If you're doing something like Simpson's rule and they don't give you the number of figures to give, go for 3sf I'd say, maybe 4 (depending on how many steps you do in the method).

    If you're doing physics, then go to 1 sf less than the most inaccurate measurement they give you, in that if they give you measurements with 3sf in all of them, only go to 2. Beyond that the errors are too large for your last digit to many anything.
    My physics teacher always told me to quote your answer to the same number of sig figs as the least accurate piece of data in the calculation.

    E.g. R = V/I = 23V/2.34A = 9.8 ohms :confused:
    Offline

    10
    ReputationRep:
    I suppose if it's only one reading, then the same is fine. If you've two or more than when you combine the errors, it'll make the last sig fig less important
    Offline

    15
    (Original post by Widowmaker)
    My physics teacher always told me to quote your answer to the same number of sig figs as the least accurate piece of data in the calculation.

    E.g. R = V/I = 23V/2.34A = 9.8 ohms :confused:
    Agree.

    Nevermind decimal places.

    It's significant figures that matters in physics. There is no point quoting more significant figures than that of the least accurate piece of data.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: June 11, 2006

University open days

  • Heriot-Watt University
    School of Textiles and Design Undergraduate
    Fri, 16 Nov '18
  • University of Roehampton
    All departments Undergraduate
    Sat, 17 Nov '18
  • Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 17 Nov '18
Poll
Black Friday: Yay or Nay?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Equations

Best calculators for A level Maths

Tips on which model to get

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.