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#1 2009-04-01 18:54:50

glenberg
Member
Registered: 2009-04-01
Posts: 8

Bodmas

Hi is there any where I can look to practice the DOBMAS rule.
I'm doing the VETASSESS test and untill now I had never heard of this rule.
eg 2+3 X 7=21 not 35. how can maths change

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#2 2009-04-01 19:09:58

ganesh
Moderator
Registered: 2005-06-28
Posts: 13,487

Re: Bodmas

2 + 3 x 7 = 23.
This is because, the order of operations is
Exponentiation (generally, this doesn't figue, so this can be overlooked),
Division, Multiplication, Addition, Subtraction.
Given the problem,
find the value of


The first operation to be done is division,
since 25 divided by 5 is 5,
the value is equal to
.
The next operation to be done is multiplication,
Since 2 x 3 = 6,

.

Mathematics or the operations on numbers don't change,
what changes is when to perform the operation, that is the order.

When brackets are used, the operations inside the brackets ought to be performed first.
for example,




.
It may be observed that the operations in the innermost brackets are performed first.


Character is who you are when no one is looking.

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#3 2009-04-01 21:25:46

glenberg
Member
Registered: 2009-04-01
Posts: 8

Re: Bodmas

Yes I know what your saying but my question in here can I find any practice like on this site mathsisfun there is long devision etc but nothing just to practice  this BODMAS. maybe that should be included from simple sums to very hard sums

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#4 2009-04-01 21:33:46

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,535

Re: Bodmas

So you are saying we need plenty of "Order of Operations" exercises? Good idea.


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#5 2009-04-01 21:36:53

glenberg
Member
Registered: 2009-04-01
Posts: 8

Re: Bodmas

do you know where I can find any Order of Operations exercises.
I need to pass a test very soon

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#6 2009-04-01 22:57:12

glenberg
Member
Registered: 2009-04-01
Posts: 8

Re: Bodmas

ganesh wrote:

2 + 3 x 7 = 23.
This is because, the order of operations is
Exponentiation (generally, this doesn't figue, so this can be overlooked),
Division, Multiplication, Addition, Subtraction.
Given the problem,
find the value of


The first operation to be done is division,
since 25 divided by 5 is 5,
the value is equal to
.
The next operation to be done is multiplication,
Since 2 x 3 = 6,

.

Is the answer to this 6 or 4

Last edited by glenberg (2009-04-01 22:59:36)

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#7 2009-04-01 23:57:20

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,535

Re: Bodmas

Have you read Order of Operations - BODMAS ... ?


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#8 2009-06-14 22:14:17

sashaRR
Guest

Re: Bodmas

i need help with this one wat is (7+12)-(3x) i dont get my teacher does not do it good am in grade 6dunno

#9 2009-06-14 23:24:27

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 84,454

Re: Bodmas

Hi sashaRR;

It you mean (7+12) - (3x) then always do what is inside of the parentheses first so

(7+12) is equal to 19 and (3x) is just 3x so your answer is

19 - 3x

Let me know if I have done what you needed.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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