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GoMath www.Gomath.com
Quickmath www.quickmath.com
S.O.S. Math www.sosmath.com
A-Plus Math www.aplusmath.com
Many students have trouble
with conversion. http://www.onlineconversion.com/length.htm
A good standards to metric,
and metric to standard conversion site http://www.brimex.com/metric_conversion.htm
For a little more options,
this is a good conversion site http://www.tomsnyder.com/classroom/timelineronline/slmathconversion.html
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