3 decameters.
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890 cm = 8900 mm 9 dm = 900 mm So, 890 cm is greater than 9 dm.
1 cm=10 m 6 cm=60 mm 1 dm=100 mm 5 dm=500 mm now,60 + 18 + 500 = 578 mm
1 dm = 10 cm 0.9 dm = 9 cm = 90 mm
1 dm = 10 cm, 10 cm = 100 mm, so 1 dm = 100 mm and 0.35 dm = 35 mm
9000 mm = 900 cm = 90 dm