The CAS Registry Mumber 146830-37-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,6,8,3 and 0 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 146830-37: (8*1)+(7*4)+(6*6)+(5*8)+(4*3)+(3*0)+(2*3)+(1*7)=137 137 % 10 = 7 So 146830-37-7 is a valid CAS Registry Number.