"Developing Numeracy: Primary Maths Dictionary" from A&C Black is an essential guide to the language and concepts used in Key Stage 2 mathematics. It gives clear, straightforward and concise definitions accompanied by many colourful diagrams and photographs to aid understanding. Worked examples offer further explanation. The words included come from all five strands of the Framework for Teaching Mathematics and cover all the words listed in the National Numeracy Strategy’s Vocabulary Book.