Number Book is a series of graded activity books designed to help children learn basic calculation skills including addition, subtraction, multiplication and division. Number Book 5 is suitable for children making the transition from Key Stage 1 to Key Stage 2 and includes: multiplication and division by 4 and 5, vertical addition and subtraction (involving borrowing and carrying), recognition of coins to 50p, counting money to GBP1.00, giving change, ‘snake sums’ (5-step number problems).