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A test on aptitude is a structured assessment that aims to evaluate the candidates’ talent and/or skill in accomplishing particular tasks without any prior knowledge or training. Assessing the basic mathematical skill of the candidates through an aptitude test can help highlight exemplary candidates who can really make a valuable contribution to their mathematical work in the future. This study focused on the construction and validation of mathematical aptitude test. The prime objective of the study was to construct and standardise an aptitude test in Mathematics for Std IX students. For this purpose, the investigator used the survey method. Fifty items of objective type were prepared. The test was administered to a sample of three hundred students in Thoothukudi. The content validity was found by the opinion of experts. The reliability coefficient was found to be 0.77.