The CAS Registry Mumber 74483-10-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,4,8 and 3 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 74483-10: (7*7)+(6*4)+(5*4)+(4*8)+(3*3)+(2*1)+(1*0)=136 136 % 10 = 6 So 74483-10-6 is a valid CAS Registry Number.