This book is about Mathematics Teachers' Competencies in the use of Information and Communication Technology (ICT) in Classroom Instruction. It looked into three levels of competencies (personal, pedagogical and subject-oriented) of mathematics teachers in the use of ICT. Factors like gender and school types were also considered. Mean and standard deviation were used to answer the research questions while t-test statistics was used to answer the null hypotheses. Results revealed a fairly competent mathematics teachers in the level of ICT.