Mentor Mathematics Learner’s Book is fully designed in line with the Competency Based Curriculum and Grade Four Mathematics design. It adequately helps the learner to achieve the specific learning outcomes for the upper school level. The book has a variety of activities that will help the learner acquire and develop skills, knowledge, values and attitude for lifelong learning. The activities are presented through inquiry-based approach and a language that is simple and clear making learning interesting and fun. The book has been authored by the most experienced teachers with a wide range of knowledge in curriculum development and teaching upper school.