There are 680 millimeters in 68 centimeters. 68 centimeters x 10 millimeters/1 centimeters = 680 millimeters 1 centimeter = 10 millimeters
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91000 mm.
680 mm is the same as 68 cm
They are both the same because 680mm equals 68cm
1 mm = .1 cm
To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in a centimeter. Therefore, 68 cm is equal to 680 mm.