30 mm is only 3 cm
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30 cm (30 centimters) is 3/100 of a meter, or 300 millimeters, about equal to a foot in length. (30 cm = 0.984 ft)
250 millimeters = 9.84 inches.
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In order to subtract, we need all units to be equal. We can either convert centimeters to millimeters or millimeters to centimeters.4 centimeters = 40 millimeters40 millimeters - 10 millimeters = 30 millimeters. (3cm)10 millimeters = 1 centimeter4 centimeters - 1 centimeter = 3 centimeters (30 mm)
35 millimeters is 1.38 inches.