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The greatest possible error is 0.0005
Integers that end in zero have an ambiguous number of significant digits: it is not possible to tell whether the number has been obtained by rounding to the nearest unit or nearest ten.Therefore, if you assume that the measure has been rounded to the nearest ten, the greatest possible error is 5 cm.
Assuming that the measurement is to the nearest 0.01, the greatest possible error is 0.005.
If the numbers are rounded to the nearest 750, then 375 is the greatest possible error. Although you are not likely to have counted in 750s, it is quite possible that you counted in 50s (greatest error = 25). Or in tens (GE = 5) or in units (ones), when the greatest error is 0.5. The greatest possible error is half of the smallest unit of measurement.