The CAS Registry Mumber 28895-15-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,8,9 and 5 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 28895-15: (7*2)+(6*8)+(5*8)+(4*9)+(3*5)+(2*1)+(1*5)=160 160 % 10 = 0 So 28895-15-0 is a valid CAS Registry Number.