90 decimetres
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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.
4,000 millimeters=40 decimeters
2.5 decimeters=250 millimeters
500 millimeters=5 decimeters
1 decimeter = 100 millimeters, so 40 decimeters = 100 * 40 millimeters, or 4000.