How much interest do I earn on my savings? What is the monthly payment I need to make for my mobile phone? Which special offer is cheaper in comparison? In everyday life, your students increasingly encounter questions that they can only answer independently if they have a solid grasp of percentage and interest calculations. This book provides you with learning and practice materials structured in small steps to help you teach calculation skills. It is particularly suitable for use in mathematics classes for students with special educational needs. After a brief review of fraction calculations, it starts with the simple calculation of 1% and 100% using the two-rule method. Following that, the calculation of percentage value, percentage rate, and base value is introduced and extensively practiced using the three-rule method. In the next step, the calculation of the three base values is carried out with the help of...