1 inch is 2.54 centimeters.
1 centimetre = 10 millimetres.
1 decimetre = 10 centimetres so 9 decimetres = 9*10 = 90 centimetres (not centameters!). Simple!
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100
100 mm = 1 dm
1 meter in 10 dm
1 dm³ = 1 l → 200 dm³ = 200 liters.
1 meter and 30 centameters
1 m = 10 dm so 94 m =94*10 dm = 940 dm. Simple!
1 dm = 10 cm so 304 dm = 304*10 = 3040 dm. So simple!
157 millimeters=15.7 centameters