You really can't just convert units that measure completely different things.
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80 mm equals 8 cm
80 centimeters = 31.496063 inches
1 meter 80 centimeters = 5 feet 1055⁄64inches.
80 dL = 8L
4 inches = 1/3 foot27 cubic feet = 1 cubic yardVolume = 80 x 1/3 = 80/3 cubic feet = 80/81cubic yard = about 0.987654321 (really!)