10 millimeters i think though decimeter=0.01 and millimeter=0.001 to a meter
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1 decimeter is 100 millimeters.
it would be 100 millimeters
1 millimeter is 1 millimeter. But, as 10 millimeters = 1 decimeter then we can state 1 millimeter = 0.1 decimeter.
You have it backwards, there are ten millimeters in one decimeter.
There isn't a full decimeter in a millimeter. A decimeter is equal to ten centimeters. There are ten millimeters in one centimeter. So, it stands to reason that there are 100 millimeters in a decimeter. But, to answer your question, there is 1/100, or 1% of a decimeter in a millimeter.