The CAS Registry Mumber 148969-22-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,8,9,6 and 9 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 148969-22: (8*1)+(7*4)+(6*8)+(5*9)+(4*6)+(3*9)+(2*2)+(1*2)=186 186 % 10 = 6 So 148969-22-6 is a valid CAS Registry Number.