The CAS Registry Mumber 115846-63-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,8,4 and 6 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 115846-63: (8*1)+(7*1)+(6*5)+(5*8)+(4*4)+(3*6)+(2*6)+(1*3)=134 134 % 10 = 4 So 115846-63-4 is a valid CAS Registry Number.