ti-83+: wtf why doesn't it divide right?

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dpopiz

Diamond Member
Jan 28, 2001
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when I enter the expression 7.4/2pi I get 11.6
when I enter the expression 7.4/(2pi) I get 1.2 (which is the correct answer)

wtf? doesn't multiplication come before division in the order of ops? why doesn't it get 1.2 when I enter w/o parentheses?
 
minendo

minendo

Elite Member
Aug 31, 2001
35,560
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Originally posted by: dpopiz
when I enter the expression 7.4/2pi I get 11.6
when I enter the expression 7.4/(2pi) I get 1.2 (which is the correct answer)

wtf? doesn't multiplication come before division in the order of ops? why doesn't it get 1.2 when I enter w/o parentheses?
Click to expand...
multiply and divide are equivalent in the order of operations. whichever comes first is the one done first.

 
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BigPoppa

Golden Member
Oct 9, 1999
1,930
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Multiplication and division are in the same order of operations category. It goes left to right, so the first one is doing (7.4/pi)*2. The second is 7.4/(2*pi).
 
M

MPankau

Member
Apr 8, 2002
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dude, multiplication and division are on the same tier in order of ops, therefore it works left to right.

MP
 
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Spikey217

Golden Member
May 4, 2002
1,687
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Order of operations

The first divides 7.4 by two then multiplies by pi

the bottom takes 7.4 divided by 2pi
 
D

Dudd

Platinum Member
Aug 3, 2001
2,865
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Because multiplication and division are treated the same. So, it does 7.4/2*pi=3.7*pi=11.6.
 
D

dpopiz

Diamond Member
Jan 28, 2001
4,454
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hm wow I wonder how many wrong answers it's given me because I didn't use parentheses and I was too lazy to do a rough check in my head
 
virtuamike

virtuamike

Diamond Member
Oct 13, 2000
7,845
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Originally posted by: dpopiz
when I enter the expression 7.4/2pi I get 11.6
when I enter the expression 7.4/(2pi) I get 1.2 (which is the correct answer)

wtf? doesn't multiplication come before division in the order of ops? why doesn't it get 1.2 when I enter w/o parentheses?
Click to expand...

Me and the TI-83+ think the same way. When I see 4/3X I think (4/3)X not (4/(3X)). Stop being lazy with the parentheses.
 
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agnitrate

Diamond Member
Jul 2, 2001
3,761
1
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i'm not so much disappointed as for the fact that he's pissed that it wasn't doing it 'right', but rather for the fact that he didn't know why. Unless you're 13 and in the 8th grade, there is no excuse to not know order of operations.

-silver
 
O

OZEE

Senior member
Feb 23, 2001
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Originally posted by: dpopiz
hm wow I wonder how many wrong answers it's given me because I didn't use parentheses and I was too lazy to do a rough check in my head
Click to expand...

Hmmmm -- ALWAYS have an idea for what the answer is before you touch the calculator. I stress this to my kids. It just does what it's programmed to do -- and if you key in something wrong, if you don't know how it works (like this example), etc... , it'll do just *EXACTLY* what you tell it to do.

Another hint for "story problems" -- always work with your units (feet, gallons, etc.) If your answer doesn't give you the right units, your number is *WRONG*
 
H

HonkeyDonk

Diamond Member
Oct 14, 2001
4,020
0
0
Originally posted by: dpopiz
when I enter the expression 7.4/2pi I get 11.6
when I enter the expression 7.4/(2pi) I get 1.2 (which is the correct answer)

wtf? doesn't multiplication come before division in the order of ops? why doesn't it get 1.2 when I enter w/o parentheses?
Click to expand...

noob
 
K

kenshorin

Golden Member
Apr 14, 2001
1,160
0
0
Originally posted by: dpopiz
hm wow I wonder how many wrong answers it's given me because I didn't use parentheses and I was too lazy to do a rough check in my head
Click to expand...

Or, how many problems you have gotten wrong because you gave it the wrong data to calculate?
 
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