Mathematics for IGCSE & O level - Estimation (Section 2 - No. 29)
When finding a sensible degree of accuracy, which is correct?
Should always be accurate.
The answer should be given to a greater degree of accuracy than any of the values used in the calculation.
The answer should be rounded, according to the original accuracy.
You should estimate.
Forklaring
Sensible accuracy is about not overstating the precision of the answer.