The CAS Registry Mumber 35611-60-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,6,1 and 1 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 35611-60: (7*3)+(6*5)+(5*6)+(4*1)+(3*1)+(2*6)+(1*0)=100 100 % 10 = 0 So 35611-60-0 is a valid CAS Registry Number.