The CAS Registry Mumber 1008965-15-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,0,8,9,6 and 5 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 1008965-15: (9*1)+(8*0)+(7*0)+(6*8)+(5*9)+(4*6)+(3*5)+(2*1)+(1*5)=148 148 % 10 = 8 So 1008965-15-8 is a valid CAS Registry Number.