The CAS Registry Mumber 34927-49-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,4,9,2 and 7 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 34927-49: (7*3)+(6*4)+(5*9)+(4*2)+(3*7)+(2*4)+(1*9)=136 136 % 10 = 6 So 34927-49-6 is a valid CAS Registry Number.