10.4.3 Calculator Wrong!

alexprice

macrumors 6502a
Original poster
Jan 8, 2005
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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
 

alexprice

macrumors 6502a
Original poster
Jan 8, 2005
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0
wordmunger said:
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.
I dont understand?

40% of 62 = 62.4?
 

wordmunger

macrumors 603
Sep 3, 2003
5,125
2
North Carolina
alexprice said:
I dont understand?

40% of 62 = 62.4?
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
 

alexprice

macrumors 6502a
Original poster
Jan 8, 2005
628
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wordmunger said:
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
Unfortunatly Maths wasn't a subject I did well on, thanks for the answer tho.

How should I do it?
 

andiwm2003

macrumors 601
Mar 29, 2004
4,325
379
Boston, MA
alexprice said:
I dont understand?

40% of 62 = 62.4?

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.
 

SilentPanda

Moderator emeritus
Oct 8, 2002
9,808
28
The Bamboo Forest
alexprice said:
Unfortunatly Maths wasn't a subject I did well on, thanks for the answer tho.

How should I do it?
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
 

alexprice

macrumors 6502a
Original poster
Jan 8, 2005
628
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I think I understand, I thought it might be a bug as 10.4.2 doesn't do it.

Thanks for the response.
 

alexprice

macrumors 6502a
Original poster
Jan 8, 2005
628
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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.
 

ElectricSheep

macrumors 6502
Feb 18, 2004
498
2
Wilmington, DE
alexprice said:
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.
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.
 

gco212

macrumors 6502
Jul 21, 2004
430
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Philadelphia
alexprice said:
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.
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).
 

Abstract

macrumors Penryn
Dec 27, 2002
24,378
110
Location Location Location
alexprice said:
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.
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.
 

MarkCollette

macrumors 68000
Mar 6, 2003
1,555
32
Toronto, Canada
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%​
 

ohcrap

macrumors 6502a
Aug 12, 2005
548
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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.
 

gwuMACaddict

macrumors 68040
Apr 21, 2003
3,124
0
washington dc
mwpeters8182 said:
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.
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:
 

alexprice

macrumors 6502a
Original poster
Jan 8, 2005
628
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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
 

jeremy.king

macrumors 603
Jul 23, 2002
5,478
1
Fuquay Varina, NC
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...
 

jeremy.king

macrumors 603
Jul 23, 2002
5,478
1
Fuquay Varina, NC
alexprice said:
The whole point in me using the calculator was that I wasn't very good with maths.
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."
 

simie

macrumors 6502a
Aug 26, 2004
995
1
Sitting
Quote:
Originally Posted by alexprice
I dont understand?

40% of 62 = 62.4?


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.

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