The CAS Registry Mumber 112924-25-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,9,2 and 4 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 112924-25: (8*1)+(7*1)+(6*2)+(5*9)+(4*2)+(3*4)+(2*2)+(1*5)=101 101 % 10 = 1 So 112924-25-1 is a valid CAS Registry Number.