The CAS Registry Mumber 102851-37-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,8,5 and 1 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 102851-37: (8*1)+(7*0)+(6*2)+(5*8)+(4*5)+(3*1)+(2*3)+(1*7)=96 96 % 10 = 6 So 102851-37-6 is a valid CAS Registry Number.