Measures and accuracy

Measures and accuracy focuses on estimation, bounds, rounding, significant figures and sensible checks, so numerical answers match the precision, units and context required by the question. Students also need to judge whether an answer is reasonable, whether a bound is upper or lower, and whether rounding has changed the meaning. Within Measures and accuracy, revision should focus on recognising the mathematical structure before choosing a method, because similar-looking questions can test different skills. A strong answer states the representation being used, shows the key calculation or reasoning step, and checks that the final answer matches the wording, units and accuracy of the question. Common mistakes usually come from applying a familiar procedure without checking the condition in the question, so each step should be linked back to the information given.