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bobbym
2009-06-15 21:24:27

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.

sashaRR
2009-06-15 20:14:17

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

MathsIsFun
2009-04-02 22:57:20

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

glenberg
2009-04-02 21:57:12

#### 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),
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

glenberg
2009-04-02 20:36:53

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

MathsIsFun
2009-04-02 20:33:46

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

glenberg
2009-04-02 20:25:46

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

ganesh
2009-04-02 18:09:58

2 + 3 x 7 = 23.
This is because, the order of operations is
Exponentiation (generally, this doesn't figue, so this can be overlooked),
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.

glenberg
2009-04-02 17:54:50

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