10.4.3 Calculator Wrong!

Discussion in 'macOS' started by alexprice, Nov 3, 2005.

  1. alexprice macrumors 6502a

    Joined:
    Jan 8, 2005
    #1
    Goto Calculator and switch to Scientific mode,

    Do...

    62 + 40% =

    What is the result?

    also

    What version of 10.4 are you using?

    In 10.4.3 I get 62.4
     
  2. wordmunger macrumors 603

    wordmunger

    Joined:
    Sep 3, 2003
    Location:
    North Carolina
    #2
    I'm using Panther and I get 86.8. But technically 40% = .4, so your answer is "right" as well. It depends on the order of operations.
     
  3. alexprice thread starter macrumors 6502a

    Joined:
    Jan 8, 2005
    #3
    I dont understand?

    40% of 62 = 62.4?
     
  4. wordmunger macrumors 603

    wordmunger

    Joined:
    Sep 3, 2003
    Location:
    North Carolina
    #4
    What your calculator is doing is this:

    62 + (40%)
    = 62 + 0.4
    = 62.4

    What my calculator is doing is this:

    62 + (40% * 62)
    = 62 + (0.4 * 62)
    = 62 + 24.8
    = 86.8
     
  5. alexprice thread starter macrumors 6502a

    Joined:
    Jan 8, 2005
    #5
    Unfortunatly Maths wasn't a subject I did well on, thanks for the answer tho.

    How should I do it?
     
  6. andiwm2003 macrumors 601

    andiwm2003

    Joined:
    Mar 29, 2004
    Location:
    Boston, MA
    #7

    mathematically 40% equals 0.4 . just check in EXCEL spreadsheets.

    or 40% of 62 equals 62 times 0.4

    what happened here is that in panther they followed the convention that the 40% is 40% of 62.

    in tiger they followed the convention that excel is using.

    both are correct.
     
  7. SilentPanda Moderator emeritus

    SilentPanda

    Joined:
    Oct 8, 2002
    Location:
    The Bamboo Forest
    #8
    62 * 40%
    +62

    Probably... I'm not at my Mac. But it sounds like you need to get 40% of 62 then add the 62.

    Or.... since you know 40% = .4 you could just do 62 * 1.4
     
  8. alexprice thread starter macrumors 6502a

    Joined:
    Jan 8, 2005
    #9
    I think I understand, I thought it might be a bug as 10.4.2 doesn't do it.

    Thanks for the response.
     
  9. alexprice thread starter macrumors 6502a

    Joined:
    Jan 8, 2005
    #10
    I'm still a bit confused, I choose +40% of the last number (62), not 1.

    Sorry if I'm starting to sound dumb, I'm just a little confused.

    Thanks again.
     
  10. ElectricSheep macrumors 6502

    ElectricSheep

    Joined:
    Feb 18, 2004
    Location:
    Wilmington, DE
    #11
    I don't see where there would be confusion. I think to implicitly compute 60 + 0.4*60 when you type 60 + 40% would create more confusion and is not a good way to build a calculator.
     
  11. gco212 macrumors 6502

    Joined:
    Jul 21, 2004
    #12
    You're not saying +40% of the last number. You're saying +40%. Percentages are just another way of writing decimals. You move the decimal 2 spots to the right, and you change from a decimal to a percentage. If you wanted to say +40% of the last number, you want to write 62 + (.4*62).
     
  12. Abstract macrumors Penryn

    Abstract

    Joined:
    Dec 27, 2002
    Location:
    Location Location Location
    #13
    You can't even use a calculator? :confused:

    How does 62 + 40% = 62 + (40% of 62)?? In no way does typing in "40%" into your calculator imply that it's 40% of 62 (ie: 62 * 0.40).

    Your way is confusing, and wrong. 62 *1.4 is what people do.
     
  13. MarkCollette macrumors 68000

    MarkCollette

    Joined:
    Mar 6, 2003
    Location:
    Calgary, Canada
    #14
    If you type:

    60 + 40%​

    that makes no sense from a mathematical perspective. 40% of what?

    Ok, so you expect it to be smart and know that it's:

    60 + 40% of whatever came before​

    So then, what should this do?

    25 + 60 + 40%​

    Should it be:

    (25 + 60) + 40% of whatever came before ==> 119​

    Or be:

    25 + (60 + 40% of whatever came before) ==> 109​

    For reference, what I would do, mathematically, is:

    60 * 140%​
     
  14. mwpeters8182 macrumors 6502

    Joined:
    Apr 16, 2003
    Location:
    Boston, MA
    #16
    How many "the OS X calculator is wrong!!!" threads are there going to be. It works fine, I've never had an issue with it.
     
  15. bluebomberman macrumors 6502a

    bluebomberman

    Joined:
    Jan 9, 2005
    Location:
    Queens, NYC
    #17
    You know you're bad at math when you don't know enough math to use the calculator properly...:rolleyes:
     
  16. ohcrap macrumors 6502a

    Joined:
    Aug 12, 2005
    #18
    This calculator "problem" has already been mentioned a few times, and it's not something anyone who knows anything about math should have a problem with.

    It's not that difficult.
     
  17. gwuMACaddict macrumors 68040

    gwuMACaddict

    Joined:
    Apr 21, 2003
    Location:
    washington dc
    #19
    was just about to bring this up...

    good grief... if apple can write an ENTIRE OPERATING SYSTEM, then i have faith that their calculator works... save for human error :rolleyes:
     
  18. alexprice thread starter macrumors 6502a

    Joined:
    Jan 8, 2005
    #20
    I fully admit that maths isn't a subject I'm good with, the reason I thought it was wrong was because it didn't do it with 10.4.2.

    Thanks for the replys, I do understand now.

    The whole point in me using the calculator was that I wasn't very good with maths.


    Alex
     
  19. alexprice thread starter macrumors 6502a

    Joined:
    Jan 8, 2005
    #21


    LOL!!!!

    I feel like the bunny.
     
  20. BrandonSi macrumors regular

    Joined:
    Oct 13, 2005
    Location:
    Chicago, IL
    #22
    I want the pancake.
     
  21. jeremy.king macrumors 603

    jeremy.king

    Joined:
    Jul 23, 2002
    Location:
    Fuquay Varina, NC
    #23
    The OP has a point so don't bash the guy for NOT doing anything wrong. Usually, on a REAL calculator, when you hit a number followed by the % key, it will take that percentage of whatever the result was on the display before entering in the percentage number. The point is that the Apple calculator in Tiger isn't behaving like a real calculator. Even the windows calculator will give the correct result.

    If you don't believe me, try it on a good ol solar powered beauty...

    62 + 40 % = 86.8

    With that said, alexprice - please brush up on your math - knowing the way percentage's translate to decimals is a good skill...It will prevent you from being taken advantage of when you go to finance something or calculating a discount or a tip...
     
  22. jeremy.king macrumors 603

    jeremy.king

    Joined:
    Jul 23, 2002
    Location:
    Fuquay Varina, NC
    #24
    And the whole reason most people aren't good with Math is the calculator...

    I digress...I love the look I get when I give more money than I need to a cashier so I wont get more bills and coins back...For example. If I buy something and the total is 5.78 and I give the cashier 11.03, they always look at me as to why I am giving the extra 1.03. My response is always "just trust me."
     
  23. simie macrumors 6502a

    simie

    Joined:
    Aug 26, 2004
    Location:
    Sitting
    #25

    10.4.3 calculator does in fact work like Excel.

    Try using this formula to find 40% of 62

    62*40/100 =24.8

    or

    62*0.4=24.8
     

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