The CAS Registry Mumber 622369-37-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,2,2,3,6 and 9 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 622369-37: (8*6)+(7*2)+(6*2)+(5*3)+(4*6)+(3*9)+(2*3)+(1*7)=153 153 % 10 = 3 So 622369-37-3 is a valid CAS Registry Number.