The CAS Registry Mumber 58848-62-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,8,4 and 8 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 58848-62: (7*5)+(6*8)+(5*8)+(4*4)+(3*8)+(2*6)+(1*2)=177 177 % 10 = 7 So 58848-62-7 is a valid CAS Registry Number.