The CAS Registry Mumber 29622-51-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,6,2 and 2 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 29622-51: (7*2)+(6*9)+(5*6)+(4*2)+(3*2)+(2*5)+(1*1)=123 123 % 10 = 3 So 29622-51-3 is a valid CAS Registry Number.