Key Maths is a series of graded activity books that reinforce children's mastery of important skills and concepts as required by the Primary National Strategy for maths at Key Stage 1. Areas covered include algebra, measures, money, fractions and data handling. Key Maths Book 1 is suitable for children making the transition from the Early Years Foundation Stage to Key Stage 1 and includes: numbers to 10, simple addition, comparative size (thicker/thinner and longer/shorter), comparative measures (heavier/lighter), o'clock times, 2-D shapes and repeating patterns.