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Estimation questions test whether students can round numbers sensibly to perform quick mental calculations. Bounds questions (higher tier) require understanding of upper and lower limits arising from measurements rounded to a given degree of accuracy.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Using the wrong rounding direction when identifying bounds (e.g., 3.5 cm rounds to 4 cm, so bounds are 3.45 to 3.55)
Forgetting that to maximise a division you use the upper bound of the numerator and lower bound of the denominator
Rounding during intermediate steps of an estimation instead of only at the start
This topic is tested by the following exam boards. Our tutors are specialists in each one.
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Take our free diagnostic quiz to find out exactly where you stand, then get matched with a tutor who specialises in number.