Number

Lower bound

The smallest value a rounded measurement could be. For 12 cm to the nearest cm, the lower bound is 11.5 cm.

Definition

Found by subtracting half the rounding unit from the rounded value. For 12 cm (nearest cm), lower bound = 12 − 0.5 = 11.5 cm. The lower bound IS included.

Used in these topics

Bounds and error intervals →

Related terms

Upper bound

The largest value a rounded measurement could be. For a length given as 12 cm to the nearest cm, the upper bound is 12.5 cm.

Practise GCSE Maths topics with instant examiner-style marking — every term in context.

Start free →