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 5 is suitable for children in Key Stage 1 who are getting ready for the transition to Key Stage 2 and includes: vertical addition and subtraction with carrying and borrowing, hundreds/tens/units, counting in 2s and 5s, fractions (1/2 and 1/4), standard units of measurement (centimetre/gram), time in minutes and symmetry.