The CAS Registry Mumber 90706-10-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,7,0 and 6 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 90706-10: (7*9)+(6*0)+(5*7)+(4*0)+(3*6)+(2*1)+(1*0)=118 118 % 10 = 8 So 90706-10-8 is a valid CAS Registry Number.