## Basic College Mathematics (10th Edition)

90. $1\times90=90$ , $2\times45 = 90$, $3\times30=90$ , $5\times18=90$ , $6\times15=90$, $9\times10=90$, So the factors of 90 are: 1,2,3,5,6,9,10,15,18,30,45,90.