You have it backwards, there are ten millimeters in one decimeter.
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250 mm = 2.5 decimeters.
To convert 9000 mm to decimeters, you need to understand the relationship between millimeters (mm) and decimeters (dm). There are 10 millimeters in a centimeter and 10 centimeters in a decimeter. Therefore, to convert 9000 mm to decimeters, you divide by 100 (10 mm x 10 cm = 100 mm). So, 9000 mm is equal to 900 decimeters.
You must multiply millimeter figures by 100 to change to decimeters.
The metric system is based on 10. For example, there are 10 millimeter in one centimeter. 10 centimeter in one decimeter. 10 decimeters in one meter. Therefore, there are 1000 millimeters in one meter.
1 square cm = 100 square mm 8 square cm = 100 x 8 = 800 square mm