ABSTRACT:Mathematics always plays vital role in academic achievements. Mathematics uphold a central stage while the other subject of science has a close relation with the same, which correlates with numbers, arrangement, quantity, logic of shape along with action research. The present study has emphasized on the effect of reasoning ability on achievements of mathematics of boy students of secondary level. 400 samples have been taken from four high school of class ix and class x of age 14 years to 17 years. These samples were collected from the schools ofblockHabra II of North 24 Parganas District and block Haringhata of Nadia district. For collecting data, stratified random sampling method has been used. Mean, Standard deviation and Pearson coefficient of correlation were followed for calculating data. The result shows that reasoning ability has positive impact on achievement in mathematic of boy students of secondary level of education.

| DOI: 10.17148/IARJSET.2021.88111