The CAS Registry Mumber 69258-65-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,2,5 and 8 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 69258-65: (7*6)+(6*9)+(5*2)+(4*5)+(3*8)+(2*6)+(1*5)=167 167 % 10 = 7 So 69258-65-7 is a valid CAS Registry Number.