Children develop the vocabulary and skills of measurement with this collection of brightly coloured worms. Use this tactile resource to help children develop an understanding of uniform non-standards units, to make direct comparisons, and to begin to explore standard units.

Contains: 80 worms in 16 sets of 5 colours. The smallest is the equivalent of 5cm, whilst the longest is 20cm. A superb resource for children aged 4 to 7, or for older children with special needs.