Mathematics curriculum used in North Cyprus emphasizes that mathematics skills help people to improve problem solving and creative thinking skills. Being able to express own ideas, critical thinking and self-evaluation are some of the skills stated in the curriculum. Portfolios are one of the best methods for students and teachers that help to consider student progress and development and a useful tool to fulfill the requirements mentioned in the curriculum. Furthermore, portfolios may also help teachers to shape their instruction, guide students through learning process and be able to identify each student's need. This book provides some information on the uses of learning portfolios to enrich mathematics classes and its effects on learning strategies such as critical thinking, elaboration, metacognitive self-regulation, peer learning and motivation such as extrinsic and intrinsic goal orientation and self-efficacy. This book also has some indications to show that portfolio has various positive implications on learning, learning strategies, achievement and motivation. Moreover, some suggestions about uses of learning portfolios are provided both for teachers and policy makers.