The CAS Registry Mumber 106976-85-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,6,9,7 and 6 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 106976-85: (8*1)+(7*0)+(6*6)+(5*9)+(4*7)+(3*6)+(2*8)+(1*5)=156 156 % 10 = 6 So 106976-85-6 is a valid CAS Registry Number.