The CAS Registry Mumber 76192-89-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,1,9 and 2 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 76192-89: (7*7)+(6*6)+(5*1)+(4*9)+(3*2)+(2*8)+(1*9)=157 157 % 10 = 7 So 76192-89-7 is a valid CAS Registry Number.