None. The abbreviation cm represents one or more centimeters. In your question there are no numbers associated with the cm unit, therefore there are no significant figures.
There are two significant figures in the measurement 210 cm.
Two significant figures are justified in this measurement. Since the measuring device ruler has smallest divisions of 0.1 cm, the uncertainty lies in the last digit. The measurement falls between 9.0 cm and 10.0 cm, so the two digits, 9 and 0, are significant.
4.05 has three (3) significant figures
This has 4 significant figures, and they are 6420
88.3 inches = 224.282 centimeters.Since 88.3 has three significant figures the answer should match and it is unlikely that you would be able to measure to a one hundredth of a millimetre. Therefore,88.3 in = 224.3 cm
There are 2 significant figures in this measurement.
There are two significant figures in the measurement 210 cm.
There are 3 significant figures
102.3 cm
29.5 cm
30.5 cm
It is: 29.5
Two significant figures are justified in this measurement. Since the measuring device ruler has smallest divisions of 0.1 cm, the uncertainty lies in the last digit. The measurement falls between 9.0 cm and 10.0 cm, so the two digits, 9 and 0, are significant.
16.67 cm
It is: 29.5 cm
5 significant figures.
When rounded to three significant figures, 0.004 738 265 cm would be 0.00474 cm.