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 multiplication and division by 4 and 5 vertical addition and subtraction (involving borrowing and carrying) recognition of coins to 50p; counting money to 1.00 and giving change 'snake sums' (5-step number problems).