Posted by Elizabeth on Monday, September 17, 2007 at 3:21am.
Metric System
How do I know when to multiply and when to divide when converting to metric or from?
Sample 450km=______mi

Science  bobpursley, Monday, September 17, 2007 at 4:02am
OK, good question. You know whatever units you start with will have to be divided by something across the fraction bar.
450km ( xxx/yyy) so km will be the units of yyy.
450km* 1000m/1km will work. Now I am in meters, and I need to get to miles. Hmmm. I know there is 1609m per mi, so
450km*1000m/1km * here I put m in the denominator so it divides out...
450km*1000m/km * 1mi/1609m and that does it.
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