The CAS Registry Mumber 948006-26-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,4,8,0,0 and 6 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 948006-26: (8*9)+(7*4)+(6*8)+(5*0)+(4*0)+(3*6)+(2*2)+(1*6)=176 176 % 10 = 6 So 948006-26-6 is a valid CAS Registry Number.