The CAS Registry Mumber 14970-15-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,9,7 and 0 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 14970-15: (7*1)+(6*4)+(5*9)+(4*7)+(3*0)+(2*1)+(1*5)=111 111 % 10 = 1 So 14970-15-1 is a valid CAS Registry Number.