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Topic: Re: Teaching Dev Mathematics Conceptually: practical ideas
Replies: 96   Last Post: May 4, 2009 5:07 AM

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 Larry Stone Posts: 25 Registered: 4/9/08
RE: Teaching Dev Mathematics Conceptually: practical ideas
Posted: Feb 8, 2009 1:17 PM

Regarding "PEMDAS":

I once had a student from Africa who would use "BODMAS", which puts brackets first, then "oxponents," then division and then multiplication. I notice that if you do all divisions before all mutliplications, it is actually equivalent to doing all multiplications and divisions in order left to right.

Example: 15 * 12 / 3 = 15 * 4 = 60; 15 * 12 / 3 = 180 / 3 = 60.

But, it is not always more convenient this way:

16 * 5 / 8 = 80/8 = 10 is more convenient than 16 * 5 / 8 = 16 * 0.625 = 10.

Just FYI!

-Larry Stone
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