40cm
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There are 10 mm in 1 cm. Therefore by moving the decimal place over by one 400mm equals 40 cm.So 51 is greater than 40, yes 51 cm is greater than 400mm.
40 cm.
centi (as in centimeter) means hundredth milli (as in millimeter) means thousandth400 thousandths of a meter equals 40 hundredths of a meter400mm = 40cmPretty easy hunh?
10
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