# order of operations [Solved!]

**RikaAlpha** 07 Jul 2016, 12:30

### My question

As the kids always say - this is probably a stupid question - but how can we assume the following order of operation:

15 divide by 3b assuming it means 15 divide by the product (3b).

15÷3b=5/b

Is it simply a matter of convention?

Does it make a difference if written as 15÷3×b ?

### Relevant page

Order of Operations - BODMAS

### What I've done so far

15/3b=5/b

but it can also mean 15/3*b

X

As the kids always say - this is probably a stupid question - but how can we assume the following order of operation:
15 divide by 3b assuming it means 15 divide by the product (3b).
15÷3b=5/b
Is it simply a matter of convention?
Does it make a difference if written as 15÷3×b ?

Relevant page
<a href="https://www.mathsisfun.com/operation-order-bodmas.html">Order of Operations - BODMAS</a>
What I've done so far
15/3b=5/b
but it can also mean 15/3*b

## Re: order of operations

**Murray** 07 Jul 2016, 19:49

Hi Rika

I often come across this when programming, where I know what I want (in this case, `15/(3b)=5/b`), but if I write 15/3b, the computer will give me `15/3xxb=5b`.

In coding, as in mathematics, multiplications and divisions are performed left to right **as you come to them**.

We have to write it with brackets to make it clear we want to divide by all of `3b`:

15/(3b)

Regards

X

Hi Rika
I often come across this when programming, where I know what I want (in this case, `15/(3b)=5/b`), but if I write 15/3b, the computer will give me `15/3xxb=5b`.
In coding, as in mathematics, multiplications and divisions are performed left to right <b>as you come to them</b>.
We have to write it with brackets to make it clear we want to divide by all of `3b`:
15/(3b)
Regards

## Re: order of operations

**RikaAlpha** 08 Jul 2016, 02:41

Thanks a lot, Murray. I agree, looking from coding side.

Regards

Rika

X

Thanks a lot, Murray. I agree, looking from coding side.
Regards
Rika

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