The CAS Registry Mumber 245-07-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,4 and 5 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 245-07: (5*2)+(4*4)+(3*5)+(2*0)+(1*7)=48 48 % 10 = 8 So 245-07-8 is a valid CAS Registry Number.