12 Digital Library of Science Publication Volume 10, Issue 1, January 2022 THE EFFECT OF CALCULATOR USAGE ON THE PERFORMANCE AND ATTITUDE OF SECONDARY SCHOOL STUDENTS IN MATHEMATICS IN GUMA LOCAL GOVERNMENT AREA OF BENUE STATE ABARI, M.T. & ZAMBER, V. Department of Mathematics Education, Joseph Sarwuan Tarka University, Makurdi ABSTRACT This study was conducted to determine the effect of calculator usage on the performance and attitude of secondary school students in mathematics in Guma Local Government Area of Benue State. The sample for this study was 240 Senior Secondary School Two (SSS2) students from two (2) government grant aided secondary schools in Guma Local Government Area of Benue State. Apparently, the study adopted a quasi- experimental design of non-randomized group, specifically, the pretest-posttest non-equivalent control group and two instruments were used for data collection: The Calculator Usage Performance Test (CUPT) and Calculator Usage Attitude Scale (CUAS). The collected data for the study was analyzed to answer research questions using mean and standard deviation and ANCOVA to test the hypotheses. The results showed that there is significant difference between the mean performance scores of secondary school students using calculator in learning mathematics and those not using calculator in learning mathematics. It also revealed that there is significant difference