Steve Chinn carefully explains how other key maths skills of addition, subtraction, multiplication and division can be used to calculate parts of a number and work otu percentages.  He shows through worked examples and clear ideas how you can learn these core skills.

He uses effective learning methods, often involving multi-sensory ideas and students are encourage to use speaking, listening, writing and seeing to build knowledge of these core mathematical skills.

The "What to do when you can't..." series build on what you do know, to teach what you do not know, and you will always know more that you think!  They are written for parents, teachers or students to use and contain clear explanations of how to build key skills.