The CAS Registry Mumber 86795-40-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,7,9 and 5 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 86795-40: (7*8)+(6*6)+(5*7)+(4*9)+(3*5)+(2*4)+(1*0)=186 186 % 10 = 6 So 86795-40-6 is a valid CAS Registry Number.