The CAS Registry Mumber 101836-32-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,8,3 and 6 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 101836-32: (8*1)+(7*0)+(6*1)+(5*8)+(4*3)+(3*6)+(2*3)+(1*2)=92 92 % 10 = 2 So 101836-32-2 is a valid CAS Registry Number.