This study intended to first formulate the M50 mix design of SCC and then replacement of sand with crumb rubber in proportion of 2.5, 5, 7.5, 10, 12.5% also with different sizes of crumb rubber like 2.3 to 4mm and 30 microns. After getting the results of compressive strength with various proportions linear regression analysis has been done which co relates size of crumb rubber replaced with the proportion to get the trend line. In this study we try to tackle the problem of scarcity of sand for construction industry and tried to bring mathematical aspect in this by which we can evaluates trends. [ABSTRACT FROM AUTHOR]