The CAS Registry Mumber 53150-16-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,1,5 and 0 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 53150-16: (7*5)+(6*3)+(5*1)+(4*5)+(3*0)+(2*1)+(1*6)=86 86 % 10 = 6 So 53150-16-6 is a valid CAS Registry Number.