The CAS Registry Mumber 95958-47-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,9,5 and 8 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 95958-47: (7*9)+(6*5)+(5*9)+(4*5)+(3*8)+(2*4)+(1*7)=197 197 % 10 = 7 So 95958-47-7 is a valid CAS Registry Number.