The CAS Registry Mumber 38214-70-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,2,1 and 4 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 38214-70: (7*3)+(6*8)+(5*2)+(4*1)+(3*4)+(2*7)+(1*0)=109 109 % 10 = 9 So 38214-70-9 is a valid CAS Registry Number.