21.
1cm = 10 mm
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Inch and centimeter are both linear units of measurement. They are used to measure small distance. The conversion is done by multiplying the inch measurement by 2.54. The above unit in centimeters equals 2.1 cm (Approximately).
80 cm equals 800 mm.
1.5 cm equals 15 mm.
230 millimeters
it equals 980 for the number model is 9.8x100=980