Associated Topics || Dr. Math Home || Search Dr. Math

### Mixed Operations

```
Date: 04/08/97 at 04:40:22
From: River House Publications
Subject: Mixed Operations

I have been working on the following problem:
839 - 319 + 200 / 20 x 15 =

The answer I first got was 540.  However, I am not so sure because I
cannot remember if I should have first multiplied the 20x15 before
working out the rest of the sum. Could you tell me what I should have
done if I was incorrect.  Thank you.

Mark
```

```
Date: 04/08/97 at 11:01:28
From: Doctor Mitteldorf
Subject: Re: Mixed Operations

Dear Mark,

Whoever gave you this problem could have been clearer, it's true.
But there is a rule that if they're not telling you what order to do
the operations in then, you just do parentheses, exponents,
multiplication-division, then addition-subtraction. So in the absence
of any other instructions I'd just go from left to right, for the
multiplication/division:

200 / 20 = 10
10 * 15 = 150

839 - 319 + 150 = 670

-Doctor Mitteldorf,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/
```
Associated Topics:
Middle School Algebra

Search the Dr. Math Library:

 Find items containing (put spaces between keywords):   Click only once for faster results: [ Choose "whole words" when searching for a word like age.] all keywords, in any order at least one, that exact phrase parts of words whole words

Submit your own question to Dr. Math
Math Forum Home || Math Library || Quick Reference || Math Forum Search