Howdy Jeff,
JE->That's what I thought, too. But, that's not right.  100mm = 1cm.
JE->100cm = 1m.
Wrong again! 100mm = 10cm = 1dm = 0.1m
Maybe it would be easier to remember this way:
m  = base value
dm = decimeter from "decimal" = 1/10th
cm = centimeter from "cent"   = 1/100th
mm = millimeter from "milli-" = 1/1000th
73 de Sam, OH0NC
 * OLX 2.2 * If plugging it in doesn't help, turn it on.
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