d is the abbreviation for deci which means tenths
m is the abbreviation fro milli which means thousandths
So: 620 mm = 6,20 dm (about 2 feet in US/British measurement)
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There are 600 millimeters in 6 decimeters. This is because 1 decimeter is equal to 100 millimeters, and 6 decimeters is equal to 6 x 100 = 600 millimeters.
75 millimeters is equal to 0.75 decimeters. To convert millimeters to decimeters, you need to divide the number of millimeters by 100.
20 decimeters is equal to 2000 millimeters.
1.43 decimeters is equal to 143 millimeters. This conversion is done by multiplying the number of decimeters by 10, since there are 10 millimeters in 1 decimeter.
990 millimeters is 9.9 decimeters.