The CAS Registry Mumber 102522-47-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,5,2 and 2 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 102522-47: (8*1)+(7*0)+(6*2)+(5*5)+(4*2)+(3*2)+(2*4)+(1*7)=74 74 % 10 = 4 So 102522-47-4 is a valid CAS Registry Number.