The CAS Registry Mumber 29246-86-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,2,4 and 6 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 29246-86: (7*2)+(6*9)+(5*2)+(4*4)+(3*6)+(2*8)+(1*6)=134 134 % 10 = 4 So 29246-86-4 is a valid CAS Registry Number.