Key Stage 2 Problem Solving is a series of graded activity books helping children to sharpen their mathematical skills. It encourages them to apply their maths skills to a range of 'real-life' situations, such as shopping and keeping score in games. Key Stage 2 Problem Solving Book 4 is particularly suitable for children who are preparing for the transition to Key Stage 3, and covers: reflection, translation, rotation of shapes, averages (mode/median/mean), metric-imperial conversions, percentages and decimal numbers, converting fractions, probability and using a calculator.