Posted by Anonymous on Friday, December 31, 2010 at 11:13am.
The "expanded form" method writing a number is explained here:
http://www.icoachmath.com/sitemap/expandedform.html
2.089 is: 2 times 1
plus 0 times 1/10 (which you can omit, since it is zero),
plus 8 times 1/100
plus 9 times 1/1000
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