For centuries, mathematics seemed to exist in service to the natural sciences  Many of the great mathematical breakthroughs, like Newton' s Calculus, were spearheaded in the effort to solve scientific questions  In the nineteenth century, though, mathematicians made it clear that the primary object of mathematical study were the abstract creations of mathematics-numbers and shapes and functions and their more abstruse extensions-irrespective of whether this study has any bearing on scientific investigation
Ttherefore, mathematics is not properly one of the natural sciences
Some great scientists, like Einstein, by their own admission, were not very good at math.